Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8e9f806a02edeba…

MALICIOUS

PDF

65.1 KB Created: 2021-02-08 14:13:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: a81311e72f4e226637b29148f047c2eb SHA-1: 98230f85af25d2dfc9b2aac17340859fb475f189 SHA-256: d8e9f806a02edeba3288d22ae45d6db67caab5b111d00afade6333724e7b24be
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable hosting services, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or malicious redirection campaign.

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://jottigo.ru/aws?utm_term=ayo+teo+rolex++mp4 PDF link annotation
    • https://fekobuwag.weebly.com/uploads/1/3/1/8/131858403/9203067.pdfIn PDF document text
    • https://levevuwakute.weebly.com/uploads/1/3/4/9/134904524/ribesirowipazewupir.pdfIn PDF document text
    • http://abzac.me/330167323987r0hz.pdfIn PDF document text
    • http://hiziryigit.online/najokugavuxezesawametlwbq.pdfIn PDF document text
    • http://lifegirls.site/55088667045t6gxb.pdfIn PDF document text
    • http://shmelev.pro/resident_evil_2_revelations_cheats38c3u.pdfIn PDF document text
    • http://fsfsfd.xyz/walalegigetufomelafufactgq.pdfIn PDF document text
    • https://kevulukopefot.weebly.com/uploads/1/3/1/4/131453006/jipopomevobowemodi.pdfIn PDF document text
    • https://vepovadubit.weebly.com/uploads/1/3/2/6/132696500/4989593.pdfIn PDF document text
    • https://fupotitora.weebly.com/uploads/1/3/4/8/134883452/3255833.pdfIn PDF document text
    • https://fevuxutub.weebly.com/uploads/1/3/4/1/134131759/78b3cd7dd648db0.pdfIn PDF document text
    • http://fsfsfd.xyz/14312302171xyitx.pdfIn PDF document text
    • http://shishkin-seed.xyz/el_hombre_multiorgsmico_audiolibroaaygv.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/sitozi/abbott_alinity_ci.pdfIn PDF document text
    • https://s3.amazonaws.com/nerugiraxura/28057330701.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_off0000c490.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC490 4824 bytes
SHA-256: 009e89bb4273f71eba0ac8f6885dd5459111a725bdd6f8e70fe0ad9331ab26a2
font_01_sfnt_off0000d4f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4F5 10320 bytes
SHA-256: 15df30c5da45cd8b783344ded2188fa4447588c1b419c82ab7c51d93f977e2cb

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