Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5c75a0d58736b26…

MALICIOUS

PDF

82.5 KB Created: 2021-04-02 08:43:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 588e79618799ba554d8638a1f6c03543 SHA-1: 588caa15126e8e137e4a6e5119d8099801b0edcb SHA-256: f5c75a0d58736b26bc097092a964cbac73a0d1bd6734910847491c45fc29efb8
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://baarspo.ru/strik?utm_term=what+treadmill+speed+is+a+30+minute+5k PDF link annotation
    • https://cdn.sqhk.co/lagexodefajo/evheTid/look_up_guided_reading_levels_for_books.pdfIn PDF document text
    • http://xokapik.mywebcommunity.org/dexaralozitakugul.pdfIn PDF document text
    • http://torixewiser.medianewsonline.com/definicion_de_aprendizaje_colaborativo.pdfIn PDF document text
    • http://dumubemajizukov.medianewsonline.com/78321710120.pdfIn PDF document text
    • https://wobufijurix.weebly.com/uploads/1/3/1/6/131607063/wuziwope_pozosi_xovuwovak.pdfIn PDF document text
    • https://cdn.sqhk.co/naxibibu/dhhFghb/tft_cheat_sheet_league_of_graphs.pdfIn PDF document text
    • https://cdn.sqhk.co/tixunadegu/hx2aHCW/lutuku.pdfIn PDF document text
    • https://xavabakonoliwif.weebly.com/uploads/1/3/4/4/134477423/rixiwejozomosizigef.pdfIn PDF document text
    • https://cdn.sqhk.co/xezojutatow/igLje1k/30460664290.pdfIn PDF document text
    • https://buvonumonub.weebly.com/uploads/1/3/5/3/135304713/gisejizi-vakakinurodog.pdfIn PDF document text
    • https://mofafodoler.weebly.com/uploads/1/3/0/8/130874416/radozapujazafar-zajofuzizaropog-jovagil-tovemowa.pdfIn PDF document text
    • https://losewilim.weebly.com/uploads/1/3/4/8/134854933/68fc3a69db.pdfIn PDF document text
    • http://bibuzikufaje.mygamesonline.org/limilonakotigowalarune.pdfIn PDF document text
    • http://kutejovanog.getenjoyment.net/aluminium_doors_and_windows_manufacturing_process.pdfIn PDF document text
    • https://bunutawopuzo.weebly.com/uploads/1/3/4/8/134868528/kikusosimobuz.pdfIn PDF document text
    • https://mufewikusa.weebly.com/uploads/1/3/4/0/134042586/3a0611faaf.pdfIn PDF document text
    • https://saritubix.weebly.com/uploads/1/3/4/5/134507132/4785172.pdfIn PDF document text
    • https://cdn.sqhk.co/mogujawogo/idihGji/26462203987.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://giduluterude.rf.gd/hr_administrative_assistant_job_description.pdfIn PDF document text
    • http://bozagasixafovo.atwebpages.com/traditional_workbench_plans.pdfIn PDF document text
    • http://magakawigola.epizy.com/search_engine_ppt_doc.pdfIn PDF document text
    • http://suduxegowur.onlinewebshop.net/what_are_the_four_duties_of_the_president.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000102de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102DE 5708 bytes
SHA-256: 732b275fa23b19014988ba9f4e88243f9e9281806d65677501d2154f4984faed
font_01_sfnt_off0001162a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1162A 11204 bytes
SHA-256: 87829d917de5f2ed44026726657ca44fd63cc30ac449f239b5a633039e41a7cf

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