Malicious PDF — malware analysis report

Static analysis result for SHA-256 bcea1e0d0be02dc4…

MALICIOUS

PDF

92.4 KB Created: 2020-11-23 20:57:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 0945b1d74fc7dd1cb9811ec8ff2ca81d SHA-1: 93977122d1176a8c93c0753d5cc774be80ba6bc6 SHA-256: bcea1e0d0be02dc467759645094ac2acfbef475635f20d9317f76cfe9df56758
186 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. 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 0.9997

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 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://trafficel.ru/123?utm_term=half+dragon+half+human+anime+boy PDF link annotation
    • https://bemitobiz.weebly.com/uploads/1/3/4/6/134681698/4c37f4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368979/normal_5fb85664797b1.pdfIn PDF document text
    • https://jukafubu.weebly.com/uploads/1/3/0/8/130874261/mofaz_roxuroj_ninel.pdfIn PDF document text
    • https://bipikutifegex.weebly.com/uploads/1/3/4/8/134868884/xefifekafozepo.pdfIn PDF document text
    • https://wozuwonasanava.weebly.com/uploads/1/3/1/4/131483955/e8b2b9790d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366947/normal_5f8d03fee951b.pdfIn PDF document text
    • https://rofexelugikovu.weebly.com/uploads/1/3/4/7/134732340/bosuxivetator.pdfIn PDF document text
    • https://xilemizafijoso.weebly.com/uploads/1/3/4/4/134483217/879331.pdfIn PDF document text
    • https://wuzajamepoxomis.weebly.com/uploads/1/3/4/0/134096323/5427249.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366335/normal_5f8d21c26f53b.pdfIn PDF document text
    • https://gekizunelim.weebly.com/uploads/1/3/4/8/134883517/loboson-dekezerekenupig-wunule-mipozete.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/pewibim/29892898795.pdfIn PDF document text
    • https://s3.amazonaws.com/fovezewi/tegiwom.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_off0001107a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1107A 8752 bytes
SHA-256: 30a612f9ba0e959d126531bfc62f3824bb1ee582394603e60e131b12847a3141
font_01_sfnt_off00012c78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C78 5348 bytes
SHA-256: e1abb169a49d20b088ac249f0b2ee2dd3e2503269a1f8a50f84cb5ca009922b9
font_02_sfnt_off00013e83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E83 11688 bytes
SHA-256: 5c818c70d7575ce69bd06fb5c5faf7f2e653ac26ef4ad1e1466244f0cd19f34f

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