Malicious PDF — malware analysis report

Static analysis result for SHA-256 314100273668eed1…

MALICIOUS

PDF

74.8 KB Created: 2021-01-16 10:56:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 76187c2740776121dac69fe2498fca4a SHA-1: 03dc50d4fbfb9a7114ed2133480463bac243f4dd SHA-256: 314100273668eed1cbf53b89a1864ded939df71dfbda3353575a37a0857f2fdf
134 Risk Score
Tags
free-cdn-ebook-manual-lure

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 an urgency-based 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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://trafficel.ru/aws?utm_term=klm+delayed+baggage+report PDF link annotation
    • https://cdn.sqhk.co/relulapezele/7hjHMVS/26258322550.pdfIn PDF document text
    • https://cdn.sqhk.co/wunasesev/ibUuBhi/amiibo_mario_odyssey_walmart.pdfIn PDF document text
    • https://nupirunu.weebly.com/uploads/1/3/4/2/134265900/223ff1ad7b5.pdfIn PDF document text
    • https://noresewikikizi.weebly.com/uploads/1/3/1/4/131453465/pegebo-ranezedapolo-dalexibezagebaw-fogasul.pdfIn PDF document text
    • https://xabetidadema.weebly.com/uploads/1/3/1/3/131398123/2908305.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451375/normal_5fd114d99c371.pdfIn PDF document text
    • https://tumixivig.weebly.com/uploads/1/3/1/6/131636813/kenilirokaju_ximojukaf_segavev_powizetu.pdfIn PDF document text
    • https://site-1171534.mozfiles.com/files/1171534/best_animated_movie_quiz_and_answers.pdfIn PDF document text
    • https://site-1178650.mozfiles.com/files/1178650/real_car_parking_3d_mod.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372087/normal_5fa3f0fa7c3a2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/zirojopemup/juxirijopazapusotawidikov.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_off0000e7d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7D0 5312 bytes
SHA-256: 108b34565c0d54d1d470227facba2600b2aa5234e2578368790116b42db26981
font_01_sfnt_off0000f9d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9D5 10716 bytes
SHA-256: cb82f09ae5b59a441b95802ef934204893abd91011c95f662ea1d0ef62affc35

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