Malicious PDF — malware analysis report

Static analysis result for SHA-256 f17bb0a750aebd1d…

MALICIOUS

PDF

71.6 KB Created: 2021-04-04 10:10:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 2fcf991441ada001ac765b3d2da49103 SHA-1: e420c293f8bd5ef1a7184abe98f88ccb4413bc0c SHA-256: f17bb0a750aebd1d8323980e5394739ce96b205dbf708b0ec58e85e6b7b765ca
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains a large number of external links, many pointing to other PDF documents hosted on disposable or suspicious domains, indicating a link farm or SEO manipulation tactic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links. No scripts were extracted, but the structure and URL patterns are indicative of a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://golowaki.ru/wix?keyword=poang+chair+cover+leather PDF link annotation
    • http://wedidizelajat.mypressonline.com/business_communication_essentials_bovee.pdfIn PDF document text
    • http://suzupuwejal.mygamesonline.org/kulipowikidememubobu.pdfIn PDF document text
    • http://mesutilixuta.sportsontheweb.net/tobifakoj.pdfIn PDF document text
    • http://guromufupadaf.iblogger.org/mcalister_s_menu.pdfIn PDF document text
    • http://pibarulajido.getenjoyment.net/asamardhuni_jeeva_yatra.pdfIn PDF document text
    • http://gutibefatidag.medianewsonline.com/free_fillable_budget_worksheet.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://9764c975-acb6-4bd5-a3ff-b1f4624bc9bc.filesusr.com/ugd/5bcb7b_652bba75c381479aa3ab0587871f9438.pdf?index=trueIn PDF document text
    • https://ac3db616-04cb-40f1-8357-c67041f5e20c.filesusr.com/ugd/eda9ba_220e47453c4444e1acf71fa1c73e7987.pdf?index=trueIn PDF document text
    • https://720c7b34-a033-4bf0-83ea-6be17de98aa2.filesusr.com/ugd/03ef8e_5930a0b26eeb4fec9b269a508274da5a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e600ab36-a0e2-4a60-af63-5e7d252175b2/rivuruxir.pdfIn PDF document text
    • http://radizala.epizy.com/vadafekebap.pdfIn PDF document text
    • https://dc688580-c0ec-4ade-910b-7abffd870ab4.filesusr.com/ugd/096b61_8f40cb4566294b5cb104e162ec561b84.pdf?index=trueIn PDF document text
    • http://fusifovizit.rf.gd/42962461628.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/92aaace3-f31b-4c50-b88d-16a3bb0f0fbc/craftsman_battery_charger_repair.pdfIn PDF document text
    • https://d56a38bf-d62e-453c-9b5b-5b2fe88aea46.filesusr.com/ugd/359e64_154ab3cb5a8349859faafc53aec884a3.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/69ec53eb-2e9d-48e6-bdb0-55cde56a07bf/amos_gilat_matlab_4th_edition_solutions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/05b5094c-8ce4-4a2c-b9f5-788c24262781/64362348765.pdfIn PDF document text
    • http://vesuduw.epizy.com/wuzusavunuwireduzawufisas.pdfIn PDF document text
    • https://dbba0f06-1911-40f0-8c80-a2638c7f81cc.filesusr.com/ugd/b13fd1_8fde191ce0684739bde30f3de3453f70.pdf?index=trueIn PDF document text
    • https://08202b68-adf4-4b7d-bb06-fcebe54c78b8.filesusr.com/ugd/76dd3d_6377ef636741491aaf8982c3337bf7e2.pdf?index=trueIn PDF document text
    • https://3c3b6f52-20a2-448a-be11-eec5930c502f.filesusr.com/ugd/0ca786_22c8f96e41ba49dc87df0e74cd249d2a.pdf?index=trueIn PDF document text
    • https://9e6c4f0b-3406-4274-bf8a-5be7f948d240.filesusr.com/ugd/45c6ff_8cbd773018b64a36906eaad51a81648a.pdf?index=trueIn PDF document text
    • https://f98f40d2-b649-4e6b-99af-b89bbf2331ff.filesusr.com/ugd/724bd4_71be0ba26eef40e2bf2c9c3a7cb97388.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/710f7878-38a2-4e95-afc4-0105ec4f35b0/dudilugurexuruwor.pdfIn PDF document text
    • https://923a8ca3-316b-4844-b38f-9bc955ad4852.filesusr.com/ugd/312e0e_e8579dbffa1b4d83a5cf843a23e7c186.pdf?index=trueIn PDF document text
    • https://469ee322-798e-4c1d-9571-af6764901f97.filesusr.com/ugd/57169b_93518fceaa6a4455b710a05be6d4a97a.pdf?index=trueIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cf48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF48 4732 bytes
SHA-256: 110f433085e27eebbcc0c34133d6933eafb8de614e0593c49815afd9dffbbc04
font_01_sfnt_off0000df4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF4D 10380 bytes
SHA-256: beb5c589d5cc18ad91969c2c81c310046da16fd1d83f03ca756a0bff52374e65
font_02_sfnt_off000102be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102BE 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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