Malicious PDF — malware analysis report

Static analysis result for SHA-256 834b7cf8911ea444…

MALICIOUS

PDF

79.6 KB Created: 2021-06-07 08:13:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 871234dc255237be1d2be797221cd83f SHA-1: eee81c0d486d68da310b3d003f608a593af90e83 SHA-256: 834b7cf8911ea4446d51206e441aa9cb16a1bd793518a73cc9d8f1a99d176835
186 Risk Score

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 0.9967

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://coretry.ru/pbw?utm_term=raid+shadow+legends+kael+build+guide PDF link annotation
    • https://ditutemisa.weebly.com/uploads/1/3/4/3/134381329/7728921.pdfIn PDF document text
    • https://fezinonod.weebly.com/uploads/1/3/1/0/131070080/susuterap-mamakin-gelovu-xivaz.pdfIn PDF document text
    • https://lotopunukulel.weebly.com/uploads/1/3/4/4/134473418/77b0b5705d.pdfIn PDF document text
    • https://widisujo.weebly.com/uploads/1/3/7/5/137512014/kogasezotun-zuxab-xibubiwitid.pdfIn PDF document text
    • https://menafove.weebly.com/uploads/1/3/1/4/131438456/99cff43b0e3dace.pdfIn PDF document text
    • https://setupazaz.weebly.com/uploads/1/3/4/7/134772318/4004272.pdfIn PDF document text
    • https://faremuxonebaw.weebly.com/uploads/1/3/4/5/134598019/zedig.pdfIn PDF document text
    • https://nitikado.weebly.com/uploads/1/3/4/6/134660078/vomawifiwebuw_pakajonaz_givurajegib.pdfIn PDF document text
    • https://raguloduw.weebly.com/uploads/1/3/4/0/134041620/powuxuvepipode_xepexi_xovidaza.pdfIn PDF document text
    • https://tasidumil.weebly.com/uploads/1/3/2/6/132680907/3550256.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385213/normal_60bd5d65cfc98.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475406/normal_60274de64545f.pdfIn PDF document text
    • https://dibotora.weebly.com/uploads/1/3/4/8/134870334/2622406.pdfIn PDF document text
    • https://fulinufifirop.weebly.com/uploads/1/3/4/6/134656376/204fb83de634252.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453550/normal_5ff9ed2a7cca8.pdfIn PDF document text
    • https://zepemotofilizag.weebly.com/uploads/1/3/5/3/135399015/wetubarifor.pdfIn PDF document text
    • https://lexobuto.weebly.com/uploads/1/3/2/7/132740623/fb74b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451755/normal_602e47271895b.pdfIn PDF document text
    • https://xidevakunowun.weebly.com/uploads/1/3/4/0/134017194/9099761.pdfIn PDF document text
    • https://xufuluzigi.weebly.com/uploads/1/3/4/2/134266078/3645640.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379718/normal_5fc61af3b5524.pdfIn PDF document text
    • https://pejifote.weebly.com/uploads/1/3/5/3/135348690/30eb0.pdfIn PDF document text
    • https://jupikojeba.weebly.com/uploads/1/3/0/9/130968920/girabenurum.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://puxivir.pbworks.com/f/vince_kath_and_james_summary.pdfIn PDF document text
    • http://lulatigono.pbworks.com/f/wikowevimanozadaduz.pdfIn PDF document text
    • http://tusoxefum.pbworks.com/w/file/fetch/144768252/legugawowam.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_off0000faea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAEA 5292 bytes
SHA-256: 3fb6e0d5404b2e56cbe1efc8ca98108a1ba4f5f583fd2f43a91c7e4fed230847
font_01_sfnt_off00010d06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D06 10480 bytes
SHA-256: 79863fcb7092d144e7ba9889bdf478bd34dcba611f5dc789abc1c5844a20a80d