Malicious PDF — malware analysis report

Static analysis result for SHA-256 51cc431f23bf4bc0…

MALICIOUS

PDF

73.9 KB Created: 2021-02-19 18:41:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 68cc0bbe2050e5c195799f17021bf27f SHA-1: 909435cb3d13fe332e492abd723da8daced36511 SHA-256: 51cc431f23bf4bc0a7fe8bb30fa14e42c3341b64d19f385d5d618c822f0632f9
176 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. It uses a callback-phone (TOAD) lure. 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 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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/123?utm_term=jlab+wireless+earbuds+charging+instructions PDF link annotation
    • https://cdn.sqhk.co/rabovafom/Njhjrjc/22406595585.pdfIn PDF document text
    • https://cdn.sqhk.co/vepefilome/vljgagi/14383226982.pdfIn PDF document text
    • https://cdn.sqhk.co/bupewazadufa/xijijij/nogapolimawofulajuwer.pdfIn PDF document text
    • https://cdn.sqhk.co/wuzosiboweja/icqifjc/wovivekixir.pdfIn PDF document text
    • https://cdn.sqhk.co/givogaduta/zmgdOPE/green_the_planet_2_cheats.pdfIn PDF document text
    • https://cdn.sqhk.co/wojipezusax/Ygciigi/kung_fu_karate_action_scene.pdfIn PDF document text
    • https://zujefimobob.weebly.com/uploads/1/3/1/4/131453463/75c4d74b4880b3.pdfIn PDF document text
    • https://cdn.sqhk.co/modonasuje/E5xUugf/battery_daddy_storage_case.pdfIn PDF document text
    • https://cdn.sqhk.co/wezufunin/hnMutid/lunafanojofeni.pdfIn PDF document text
    • https://cdn.sqhk.co/mixenezir/ahdgfii/31212006869.pdfIn PDF document text
    • https://cdn.sqhk.co/bekutojeke/x4gc1ia/emoney_customer_service_email_response_samples.pdfIn PDF document text
    • https://cdn.sqhk.co/wogokodu/dl0Gsld/srs_light_reset.pdfIn PDF document text
    • https://cdn.sqhk.co/mogizufofuj/djcgf5R/bluestone_and_hockley_tenant_login.pdfIn PDF document text
    • http://tozevikuju.66ghz.com/honda_gc190_pressure_washer_pump_removal.pdfIn PDF document text
    • https://cdn.sqhk.co/xovatagemi/diahfib/gulixepiwo.pdfIn PDF document text
    • http://dusexixegiseves.iblogger.org/42085096129.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nefotux.epizy.com/separation_agreement_template_nz.pdfIn PDF document text
    • http://womunek.rf.gd/free_amazing_animated_powerpoint_templates.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_off0000e143.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE143 5424 bytes
SHA-256: 52ab62793089bce5b90318e3c7bd3ec03ebddf6dbe03fe68c832abeefb064601
font_01_sfnt_off0000f3b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3B8 11420 bytes
SHA-256: 7fa38894474e1a25326ff294ec807406098821fbb4fda8a35732ae2bdae3981f

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