Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b5922e6b84ce8ad…

MALICIOUS

PDF

74.9 KB Created: 2021-05-26 13:15:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 66f2cb1476788bedcd3d27a3241a569a SHA-1: 8d709c9677f054e5423fb0b68a2224ed46ab8b14 SHA-256: 6b5922e6b84ce8ad03dac298cec4a51da5f0dcd692ecf0e7a11de37d07b59662
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. The embedded URLs and the heuristic findings point towards a tactic of using seemingly helpful content to mask malicious redirection.

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://vilenefex.ru/strik?utm_term=how+to+pair+my+airpods+to+my+samsung+phone PDF link annotation
    • https://xutogimumunode.weebly.com/uploads/1/3/4/3/134375265/6c33680146.pdfIn PDF document text
    • https://kilutiwoxit.weebly.com/uploads/1/3/1/6/131636983/8e99001616eb.pdfIn PDF document text
    • https://fugomunufu.weebly.com/uploads/1/3/4/5/134586131/dexitapowubute.pdfIn PDF document text
    • https://puluzoxaxidu.weebly.com/uploads/1/3/2/6/132683087/kimobe_weximalalip_funijebu.pdfIn PDF document text
    • https://fomuropuzukamu.weebly.com/uploads/1/3/4/7/134728801/mozusizusogixis-sosimomoj.pdfIn PDF document text
    • https://bazowumisobebu.weebly.com/uploads/1/3/5/3/135329866/5015992.pdfIn PDF document text
    • https://fafenerukore.weebly.com/uploads/1/3/1/3/131398145/1053397.pdfIn PDF document text
    • https://famuzupowaja.weebly.com/uploads/1/3/1/4/131406758/risufodogaz-madumovaluk-wusutujojupase-gumad.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4472213/normal_5fd0492c39dfd.pdfIn PDF document text
    • https://vimitorumu.weebly.com/uploads/1/3/0/8/130814921/5991902.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489061/normal_602e10916a61d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377679/normal_5fd18b65e4ce3.pdfIn PDF document text
    • https://wogalipa.weebly.com/uploads/1/3/4/3/134316604/21c95f7a6a.pdfIn PDF document text
    • https://mobesometug.weebly.com/uploads/1/3/4/6/134644263/6224697.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4499329/normal_5fd3db4039415.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/mubefula/the_child_by_tiger_short_story_summary.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6d101883-3382-431b-ac4c-ee25a28989b4/xapunupebamekilanonapoke.pdfIn PDF document text
    • https://s3.amazonaws.com/fonazuzixagizir/61455753971.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6878d00a-dc47-412a-9bb9-7726de8750f6/4242392794.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bba6314a-0b94-4f9d-a513-b32084b7fefb/axxess_aswc-1_steering_wheel_control_adapter_instructions.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_off0000e65e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE65E 5496 bytes
SHA-256: 9b5020f36a244de63988bfc04a88f3241b34c46c4a7e4577233fa5a2e1692a31
font_01_sfnt_off0000f8fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8FB 10744 bytes
SHA-256: 59d48872a194a75a62b99003a8ed6fd70d465a2869187e1e98ec6e1154ae1cfb