Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bd64ea242af4ee8…

MALICIOUS

PDF

87.5 KB Created: 2021-04-26 00:59:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: de329179660700387149de72d3e0ca27 SHA-1: d8323255d2d700caca1edfaebc632a69db4cc5ce SHA-256: 4bd64ea242af4ee802fb2ee8aed3d5d2117d91a57044e683c65d4a562236bf09
226 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier. It contains a large number of external links, many pointing to disposable domains, suggesting a link farm or SEO poisoning tactic. Some links are also flagged as suspicious lures, indicating an attempt to redirect users to potentially harmful content. No scripts were extracted, but the PDF structure itself facilitates the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 7

  • 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.
  • Image-heavy PDF with invisible link to suspicious domain high PDF_SUSPICIOUS_LINK_LURE
    PDF is a small image-heavy lure with invisible link annotations that send the user to a suspicious high-risk-domain URI. This matches credential-phishing carriers where the visible document is only a prompt and the real collection flow happens on the linked website.
  • 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://maypoin.ru/strik?utm_term=troy+bilt+super+tomahawk+chipper+shredder+manual PDF link annotation
    • http://xtrading.buzz/what_is_the_covid_situation_in_portugalbdaxv.pdfIn PDF document text
    • https://cdn.sqhk.co/jidelugob/dhboieW/princess_coloring_book.pdfIn PDF document text
    • https://cdn.sqhk.co/xawodoze/hjjfjs8/40k_adeptus_mechanicus_codex.pdfIn PDF document text
    • https://cdn.sqhk.co/wixikinotu/eCgchcc/25072905020.pdfIn PDF document text
    • https://pusesame.weebly.com/uploads/1/3/4/6/134662227/8686073.pdfIn PDF document text
    • http://lazisirogabidir.mypressonline.com/afrikaans_language_notes.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492281/normal_601d02e8a9741.pdfIn PDF document text
    • http://obschee.xyz/fortnite_cryptogram_answers9pjpg.pdfIn PDF document text
    • http://foripekomufotir.mypressonline.com/84566666558.pdfIn PDF document text
    • https://sukigemanewa.weebly.com/uploads/1/3/2/6/132681928/repugogomej.pdfIn PDF document text
    • http://wtia.space/sigasuricrt3q.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489595/normal_6053a9d645aac.pdfIn PDF document text
    • http://loginwithfb.site/elder_scrolls_online_tips_and_tricks_xbox_one6jkst.pdfIn PDF document text
    • https://cdn.sqhk.co/gaxudofexal/gjjhUge/wikipedia_dictionary_english_to_urdu.pdfIn PDF document text
    • https://cdn.sqhk.co/zojisixu/ajghhij/taiwanese_pinball_machine.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://uploads.strikinglycdn.com/files/4bbfc7f7-a46b-4c90-89cd-2b27a0ebd6b2/52192957645.pdfIn PDF document text
    • http://pusebirenox.myartsonline.com/tepugikevekasipitis.pdfIn PDF document text
    • http://sivikonalijuto.myartsonline.com/tojunududulatej.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/22327bcd-49d1-48cb-8780-f49c36aa02ac/categorical_syllogism_venn_diagram_examples.pdfIn 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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f32e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF32E 5544 bytes
SHA-256: b5b2b5c82a9fb3799768eccb4650b5816d8d518e29b730f7a6b260c2ae0e11da
font_01_sfnt_off000105ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105EE 11288 bytes
SHA-256: 84c7dbdf4162f8209424fe0c06b7564c54dbbee8fd7a3fb62dea64b9922a3c35
font_02_sfnt_off00012c99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C99 16228 bytes
SHA-256: 12025b4d7aa04fb8f69941e4d866040d4f6caaea9902973765e58cdc1b50fbbe
font_03_sfnt_off000141f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141F7 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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