Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce06d7d3e2b2259c…

MALICIOUS

PDF

90.3 KB Created: 2021-02-21 09:25:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0c801dab710125de99488b12217b6126 SHA-1: e2b0693fdafe7891efd424e6d68f6a1bcd49009c SHA-256: ce06d7d3e2b2259ca1e40c56e41a79255c484c7de6a8620533e44743f86934a9
186 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as Pdf.Phishing.Trojan. The document body, though heavily obfuscated, appears to be a lure related to a TED talk transcript, which is a common tactic for social engineering.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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.
  • 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://maypoin.ru/123?utm_term=emotional+first+aid+ted+talk+transcript
    • https://gagakulusete.weebly.com/uploads/1/3/5/3/135326625/risukikatofelegu.pdf
    • https://damujulul.weebly.com/uploads/1/3/5/3/135335913/lanepivilejo.pdf
    • https://leresawukulet.weebly.com/uploads/1/3/1/3/131384076/0a2cdcb624.pdf
    • http://webmastervlad.ru/all_the_bright_placesnwk1l.pdf
    • https://kiwakamumosa.weebly.com/uploads/1/3/5/9/135963193/8422984.pdf
    • https://kobivepetere.weebly.com/uploads/1/3/1/8/131871499/wetopini.pdf
    • https://cdn-cms.f-static.net/uploads/4530036/normal_60276c651fa44.pdf
    • https://zurobalunaxul.weebly.com/uploads/1/3/2/7/132712088/c6db7.pdf
    • https://govabegos.weebly.com/uploads/1/3/4/0/134018252/aab663a.pdf
    • https://static.s123-cdn-static.com/uploads/4381090/normal_5fc5a223d4506.pdf
    • https://fimuvuxufubewi.weebly.com/uploads/1/3/4/4/134442536/xekunojovagabinave.pdf
    • https://cdn.sqhk.co/pomoliwekag/dR48xT5/siren_head_3d_horror_mod_2020.pdf
    • https://xejapekedom.weebly.com/uploads/1/3/4/8/134864907/saralaxev-birezozatumimuj-zaviduw.pdf
    • https://redodire.weebly.com/uploads/1/3/1/4/131408340/sudeterob-ziwuwa-kukivo.pdf
    • https://vugifalufaduzo.weebly.com/uploads/1/3/4/8/134889855/kegemerumusokuvex.pdf
    • http://strengthsphoe
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012689.bin
099c4fdf6867cf4ac21587e7103adc9fa58a69c502df6e3fd7815b1829d1e862		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12689 5324 bytes
font_01_sfnt_off00013891.bin
bb93865d220c7ed7d19366f1ad5e738d9f05d81470ed0d4e7681fbd84123e82a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13891 10416 bytes

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