Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6faa01eb6aed183…

MALICIOUS

PDF

82.5 KB Created: 2021-04-30 15:28:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 6ae4c717693d502082b630d0a4004752 SHA-1: d0c9ae4acec78a7e0521f942871ad14508410ad5 SHA-256: c6faa01eb6aed1839957be5fcac6411b83b38f22758618bba1e3c49d304afba5
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 0.9998

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://midufefew.ru/strik?utm_term=baldur%2527s+gate+dark+alliance+2+how+to+unlock+secret+characters PDF link annotation
    • https://koxofekidoponu.weebly.com/uploads/1/3/3/9/133997415/natifilumonunal.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370778/normal_6050746ed3fdb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391611/normal_60114594a7d62.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393514/normal_5fe8b5e2bc140.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413017/normal_602b567d6498b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369505/normal_6051b50b3a877.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456377/normal_606734c88a915.pdfIn PDF document text
    • https://tunefanixeso.weebly.com/uploads/1/3/4/7/134733210/nerisenilewivisodof.pdfIn PDF document text
    • https://defelidiko.weebly.com/uploads/1/3/1/0/131070982/b5afd920142.pdfIn PDF document text
    • https://lemamoramu.weebly.com/uploads/1/3/5/3/135348447/nulol.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465719/normal_5fdd038f51ad7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://d09251a9-b09e-4077-8ccb-24037f005f7b.filesusr.com/ugd/a6ce17_911fb01268374224aaab5207c0860fb0.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/991b0890-fcf4-4b3f-84a2-6dcd4e14b186/bitcoin_money_adder_activation_code_free_download.pdfIn PDF document text
    • https://34ea5197-a9e9-4ba5-99bb-a7dd7aeba98b.filesusr.com/ugd/234f58_8945424f2b8544e891ba6291fd175638.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/810f9518-96c2-4f00-a80f-7e2992b7b989/schwinn_ad2_airdyne_exercise_bike_parts.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3d4ac174-9056-4b49-87f6-e8e19cf99ec6/how_to_mla_cite_the_declaration_of_independence.pdfIn PDF document text
    • https://s3.amazonaws.com/vofadoloves/xajenosevategebepudoribam.pdfIn PDF document text
    • https://7c8f45b7-e058-4e27-bccd-8ee7dcb26900.filesusr.com/ugd/d5cf39_a6863cf5848347d39292ec4503c186b5.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/ninazarila/xeneniruzezozukaxaguxu.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_off0000fcfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCFA 5572 bytes
SHA-256: ee2b5cec4d1ded33f6dcd32b0a5df4f852af21f7e89e94e1535f3c97fe702da3
font_01_sfnt_off00011002.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11002 13304 bytes
SHA-256: c58135eaeb01a48adeef04263d49a0778c82ea172e323e4480c40f6ab6e24fcf