Malicious PDF — malware analysis report

Static analysis result for SHA-256 de92a021878501e7…

MALICIOUS

PDF

79.0 KB Created: 2021-01-20 14:47:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 8b8118e4bd8b4e0cf4be16acca9da520 SHA-1: 452d99602b22eda7abdcf178a8f06cd7d9dcbf98 SHA-256: de92a021878501e72dce166cd307baf9219e91018530baa8764649af385391b4
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, with many pointing to disposable hosting services. This structure is indicative of a phishing or malware distribution campaign. The ClamAV detection and ML classifier strongly support the malicious verdict. No scripts were extracted, but the presence of numerous external URLs suggests the document's primary purpose is to redirect users to malicious sites.

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.
  • 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://druttle.ru/123?utm_term=the+americans+chapter+29 PDF link annotation
    • https://site-1171584.mozfiles.com/files/1171584/40288209398.pdfIn PDF document text
    • https://xujuladobagaju.weebly.com/uploads/1/3/1/4/131437733/gafuvage_noboluvij.pdfIn PDF document text
    • https://kenaveduku.weebly.com/uploads/1/3/0/8/130813649/e15dc6.pdfIn PDF document text
    • https://site-1173259.mozfiles.com/files/1173259/85806528207.pdfIn PDF document text
    • https://nelizebowi.weebly.com/uploads/1/3/4/7/134734992/d9329.pdfIn PDF document text
    • https://xoxatazafej.weebly.com/uploads/1/3/4/8/134861408/7620203.pdfIn PDF document text
    • https://cdn.sqhk.co/vixuzemabad/fhif5EQ/amtrak_phone_number_in_sacramento.pdfIn PDF document text
    • https://donelodef.weebly.com/uploads/1/3/5/4/135401433/zibexunovadolasap.pdfIn PDF document text
    • https://site-1168194.mozfiles.com/files/1168194/kuvodowezuwi.pdfIn PDF document text
    • https://digokevun.weebly.com/uploads/1/3/4/7/134747151/tugadafedo.pdfIn PDF document text
    • https://nuwofukejixi.weebly.com/uploads/1/3/1/4/131437867/fd112.pdfIn PDF document text
    • https://site-1234129.mozfiles.com/files/1234129/63799131222.pdfIn PDF document text
    • https://kapejipe.weebly.com/uploads/1/3/1/0/131070538/rigolafu.pdfIn PDF document text
    • https://bipokedofep.weebly.com/uploads/1/3/5/3/135322207/lunoxojarefizosan.pdfIn PDF document text
    • https://xisuviwilizej.weebly.com/uploads/1/3/4/3/134320176/af3ee8982.pdfIn PDF document text
    • https://fikanofuzak.weebly.com/uploads/1/3/1/4/131438747/jegagusofimipe_mekekulim_pirigunavuxufel_womonerizexubit.pdfIn PDF document text
    • https://site-1172308.mozfiles.com/files/1172308/79497250379.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000f687.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF687 5376 bytes
SHA-256: 450ef65b3e5467e061fdd85ca814a56410e756be5d72060fc375bc73549b8735
font_01_sfnt_off000108a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108A1 11168 bytes
SHA-256: dcc8a5a749cb7a96d5450a7c0ebf589c26269ce85f9f5ea57b92754e6b960aeb

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