Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2c2604777cf059f…

MALICIOUS

PDF

64.6 KB Created: 2021-01-18 17:40:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: a1b561440606e93e92981882fcd57dd2 SHA-1: a7d82348258afec52d961251407157fa6e5c2b57 SHA-256: a2c2604777cf059f3b72bdeed1e299e9fdf4336181caf315e98ef69d8ac3be9f
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 identified as malicious by multiple heuristics and an ML classifier, with ClamAV detecting it as Pdf.Phishing.Trojan. The file contains a link farm with numerous external PDF links, suggesting a phishing or SEO manipulation scheme. The primary lure appears to be related to a 'law of cosine worksheet doc', which redirects to a large collection of other PDFs hosted on disposable domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://trafftec.ru/123?utm_term=law+of+cosine+worksheet+doc PDF link annotation
    • https://wawenefawopi.weebly.com/uploads/1/3/4/4/134494228/baferedoxowi.pdfIn PDF document text
    • https://cdn.sqhk.co/businaxidare/chczfdz/radioactive_film_box_office.pdfIn PDF document text
    • https://cdn.sqhk.co/kowaziwaso/e8CBjbq/wbtc_token_airdrop.pdfIn PDF document text
    • https://jigupipugefelo.weebly.com/uploads/1/3/4/3/134387822/9986981.pdfIn PDF document text
    • https://kidivine.weebly.com/uploads/1/3/4/5/134576756/nuvokugopisu-mipuxonapotofod-gusazanutukarak.pdfIn PDF document text
    • https://toraboretopupu.weebly.com/uploads/1/3/4/7/134769369/c928cc2509261c0.pdfIn PDF document text
    • https://cdn.sqhk.co/gafisasiwu/gcjaMOt/pegamibuxipotenojiwujekab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372373/normal_5fc2c42b5c36d.pdfIn PDF document text
    • https://cdn.sqhk.co/midipumep/jto0nji/rugitevedutozevuwalavem.pdfIn PDF document text
    • https://gukigosipuwerus.weebly.com/uploads/1/3/4/7/134755691/jidubavuzagezuniwa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368984/normal_5f93579bcc9b8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444102/normal_5fd2ca2a7821a.pdfIn PDF document text
    • https://tofuxatedev.weebly.com/uploads/1/3/4/7/134706151/fakagoxefikolekopuk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417986/normal_5fbc5c5938c15.pdfIn PDF document text
    • https://sijezivupo.weebly.com/uploads/1/3/1/4/131408567/3833246.pdfIn PDF document text
    • https://cdn.sqhk.co/tokititagiwe/FidiflF/hard_rock_cafe_songs_list.pdfIn PDF document text
    • https://vesovagesigopek.weebly.com/uploads/1/3/4/6/134614223/sapivol.pdfIn PDF document text
    • https://wazajatagif.weebly.com/uploads/1/3/4/3/134376275/divomolu_dajexafesojop_wasilunotizupe.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_off0000c2c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2C9 5172 bytes
SHA-256: 1a38b14801eb503646a89fc519e3b64d664e8b1af040180624e3102691e31eb1
font_01_sfnt_off0000d479.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD479 9704 bytes
SHA-256: 6f12a19632368dde60fd579763539372722b7e802263ecacd2d82e4033aca864

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