Malicious PDF — malware analysis report

Static analysis result for SHA-256 faf1c109d6c24e6d…

MALICIOUS

PDF

89.2 KB Created: 2021-04-07 06:55:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 7458ceeeb89f8e1fa201dcb14d6d14a0 SHA-1: 7254c925240f49b92b961e425a8fc0765cb701a4 SHA-256: faf1c109d6c24e6dfd95b0b289827e989b7d4925a457bb944909c9eb6dab199f
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 0.9997

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://gimoguvi.ru/strik?utm_term=how+to+replace+a+belt+in+a+washing+machine PDF link annotation
    • https://palisuxil.weebly.com/uploads/1/3/1/0/131071308/mididosupu_rarewa_vawodama_kuxatanodulez.pdfIn PDF document text
    • https://fogolimavoburaj.weebly.com/uploads/1/3/0/8/130813413/gujujanikimoparas.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446168/normal_60131e1b109b9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408485/normal_6040a70d25ed8.pdfIn PDF document text
    • https://nutuneronasida.weebly.com/uploads/1/3/4/2/134266022/2853724.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://46ebecaa-9490-439b-bba6-ee77f1a6ca93.filesusr.com/ugd/cee8a1_8f866d9a96a0430090d96cadea67e3bc.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jikopot/bravissimo_transformado_junho_2019_iks.pdfIn PDF document text
    • https://s3.amazonaws.com/xuzed/63916195932.pdfIn PDF document text
    • https://5e446c31-fcb6-4427-a178-91ee45bbff8b.filesusr.com/ugd/4e76b8_22f746e8e6c340118ef9a094f52dedf3.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/7577139e-b1ce-4f6a-ac85-8391384e647c/sozaxipuj.pdfIn PDF document text
    • https://d4180a97-8dd0-4bf1-9e2f-d1b128d1a64d.filesusr.com/ugd/ae059d_68dd9272d21a4862bb86029169cc2aa2.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b8fb53e8-5a87-4e9d-8193-db35b0a209fc/the_devil_wears_prada_movie_trailer.pdfIn PDF document text
    • https://s3.amazonaws.com/wazagidonux/antivirus_software_app_for_android_mobile.pdfIn PDF document text
    • https://73e25548-3913-4bbb-aa69-a1b25f69568d.filesusr.com/ugd/cece23_b63aec3592324ef8b56746b7e88c5dba.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/43534c19-f3bf-40c7-8d60-8ab0f5b6e884/45629965705.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1176e7fe-0f1c-41be-afc5-3d6e8182bcd2/telamuladi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/355d26e4-bceb-407b-b0a1-60b2433b74b9/kejep.pdfIn PDF document text
    • https://s3.amazonaws.com/doxifuba/35204811579.pdfIn PDF document text
    • https://7ef7ebf0-bcb0-4ca2-8538-5a19c3e9f01c.filesusr.com/ugd/aff7ca_0ea4c40781754b47a148bb060cc85f49.pdf?index=trueIn 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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010a4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A4C 5540 bytes
SHA-256: b94a4815bc2e8545761e88c9233cba8e86e8bdb2159d54f61f465d1c308edd04
font_01_sfnt_off00011d02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D02 10840 bytes
SHA-256: 87b594b3f22f1d4ad477f9a2c4d17a9985cb2773698eb58c2d74bd9401879e3e
font_02_sfnt_off00014202.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14202 16148 bytes
SHA-256: 333c6b7950143ef5b768b9d621755905cb9f9f437be433e332b6baa8edb2b5fd