Malicious PDF — malware analysis report

Static analysis result for SHA-256 652727d0b9b4a548…

MALICIOUS

PDF

73.2 KB Created: 2020-11-26 02:46:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 313cc2b0df16ef77ced0063351a28919 SHA-1: 1e5ba7117c03f2d5d342132d8f79abbc21226bd0 SHA-256: 652727d0b9b4a5489447a496ce135044cd2a1596d470c9eeaf3d27d4d4e29b55
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by a machine learning classifier and ClamAV. It contains a significant number of external links, many pointing to disposable domains, indicating a link farm or SEO manipulation tactic. One of the primary URLs extracted is 'https://traffnew.ru/123?utm_term=steel+seal+head+gasket+fix+reviews', which suggests a potential phishing or scam lure related to automotive repair. The presence of numerous external links, including one to 'https://cdn-cms.f-static.net/uploads/4366654/normal_5f8766221a3f7.pdf', strongly suggests the document's purpose is to redirect users to other potentially malicious or misleading content.

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://traffnew.ru/123?utm_term=steel+seal+head+gasket+fix+reviews
    • https://cdn-cms.f-static.net/uploads/4366654/normal_5f8766221a3f7.pdf
    • https://rokufekajo.weebly.com/uploads/1/3/0/8/130814342/vuvolonasase-jijifidelenum-lemilaj-dexiboxe.pdf
    • https://cdn-cms.f-static.net/uploads/4402707/normal_5fa89eb116eb4.pdf
    • https://janonezofeto.weebly.com/uploads/1/3/4/6/134664798/fasanagorusugibinid.pdf
    • https://fupexorugukemig.weebly.com/uploads/1/3/0/8/130814763/sileva.pdf
    • https://xesilowavexaweg.weebly.com/uploads/1/3/4/2/134265648/7752043.pdf
    • https://wesofozuxo.weebly.com/uploads/1/3/4/2/134266961/kizuje_pizaxudamekek.pdf
    • https://cdn-cms.f-static.net/uploads/4379742/normal_5f9bc00a32586.pdf
    • https://xabetujozuveko.weebly.com/uploads/1/3/4/6/134682227/44fbf42.pdf
    • https://nutikatike.weebly.com/uploads/1/3/4/6/134601603/2489581.pdf
    • https://viweposedijul.weebly.com/uploads/1/3/1/0/131070314/dapolawebufazu.pdf
    • https://gibiboxovozigux.weebly.com/uploads/1/3/4/7/134722082/rijekadunejerumi.pdf
    • https://kupajozowujuz.weebly.com/uploads/1/3/4/8/134881722/zudibejij.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/defeacc3-1c61-44ed-9162-c5a031fb0987/the_art_of_problem_solving_in_physic.pdf
    • https://uploads.strikinglycdn.com/files/2980d053-aa69-4b47-aaee-97fb69924b09/67545860664.pdf
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c9a7.bin
3c4b92411abccdde475bc40a5074e2f41f8e180296733986594e48a16cada216		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC9A7 7112 bytes
font_01_sfnt_off0000e20e.bin
0968045543dc84d05dda3790f6f57d4035c7398d361779f78fc71075c9363bc1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE20E 5556 bytes
font_02_sfnt_off0000f503.bin
85b5e705529264f27ce5f1a736705805972b1f33f4c6e405ce2f6a48e5a6689a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF503 10100 bytes

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