Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9e2f1f828f604a2…

MALICIOUS

PDF

69.6 KB Created: 2021-01-11 18:18:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: ba1b44133888e3c9bfc16a4ee1b4c331 SHA-1: 98c249bca6dab9d505a28007568154744124c524 SHA-256: f9e2f1f828f604a2d4d8f83eb0b9721a97eb330b610fa1a4c3861e795de6759f
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged by multiple heuristics as a link farm and by a machine learning classifier as malicious. It contains numerous external links, many hosted on disposable domains, suggesting an attempt to drive traffic to potentially malicious or spam content. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature. No scripts were extracted, but the overall structure and URL patterns indicate a phishing or SEO spam attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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.
  • 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://traffking.ru/aws?utm_term=past+tense+worksheets+grade+4 PDF link annotation
    • https://cdn.sqhk.co/fewukise/6iejjox/can_i_stream_nbc_sports_bay_area.pdfIn PDF document text
    • https://wexixumativedo.weebly.com/uploads/1/3/4/8/134865676/0e9f643d6bc78b5.pdfIn PDF document text
    • https://poxotedodesogin.weebly.com/uploads/1/3/4/3/134305686/8148628.pdfIn PDF document text
    • https://bidukupe.weebly.com/uploads/1/3/4/3/134348295/a384c5f15.pdfIn PDF document text
    • https://cdn.sqhk.co/numovasovev/zhcJXHg/clay_sculpture_artists_near_me.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383916/normal_5f9dc7c23104f.pdfIn PDF document text
    • https://cdn.sqhk.co/molewekane/hfCGoJ7/wevalanogo.pdfIn PDF document text
    • https://kigazodiraju.weebly.com/uploads/1/3/4/6/134678535/994413.pdfIn PDF document text
    • https://kivofijola.weebly.com/uploads/1/3/4/3/134309380/becd5fc.pdfIn PDF document text
    • https://kivofijola.weebly.com/uploads/1/3/4/3/134309380/musomuwole_limoxivon.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://s3.amazonaws.com/godewumazek/91075730373.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c758.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC758 5040 bytes
SHA-256: 691cb8953fe0042fde113c8aeb0b399cfa8697e4f4bb75ad9c30d0892e9a898c
font_01_sfnt_off0000d879.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD879 10360 bytes
SHA-256: d2c2230ac130a08560795c78e366ffdbb103e12fc8aa9f03c0f4d8bf5bb1e957
font_02_sfnt_off0000fbe8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBE8 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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