Malicious PDF — malware analysis report

Static analysis result for SHA-256 16fa5dcc188e12d8…

MALICIOUS

PDF

88.3 KB Created: 2021-02-06 12:20:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 43f53f3bcdeb96a44d198f94be89d466 SHA-1: 85378c15c50d3d7c52801000dd313ef10bbe5364 SHA-256: 16fa5dcc188e12d81aef9eeb6023ff25f52ff299ee11a44294ecc04cf7b0a38f
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The presence of embedded URLs and the PDF structure itself point towards an attempt to redirect users to potentially harmful content.

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://seumenha.ru/123?utm_term=mortal+engines+dvd+release+date+nz PDF link annotation
    • https://robaralimojo.weebly.com/uploads/1/3/0/8/130814718/08dc919b7a4f78.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414486/normal_5ff65edc59028.pdfIn PDF document text
    • https://zovejesuvenej.weebly.com/uploads/1/3/1/4/131438366/4753219.pdfIn PDF document text
    • https://cdn.sqhk.co/bupewazadufa/fhdzjaF/rutexaju.pdfIn PDF document text
    • https://dojudetokin.weebly.com/uploads/1/3/4/6/134613144/34200.pdfIn PDF document text
    • https://dokegofixak.weebly.com/uploads/1/3/0/8/130873830/kepegudu.pdfIn PDF document text
    • https://cdn.sqhk.co/jedugifaxido/b3jePse/muvinidorasipuwewuse.pdfIn PDF document text
    • https://cdn.sqhk.co/tumosirewuw/bhfFjhS/adventure_academy_reviews_australia.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4456398/normal_60056434d40e1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382208/normal_6017a79180aba.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454172/normal_5fc5992d6fa12.pdfIn PDF document text
    • https://cdn.sqhk.co/vizoxaxijojo/ghUHyih/fitbit_versa_2_bands_ebay.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393785/normal_601ddc591d040.pdfIn PDF document text
    • http://makedctl.site/tadubisowexunizebq5jdz.pdfIn PDF document text
    • http://revershjtb.site/nimikepusumidiwuleralavp53a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450504/normal_5fc766635e4cc.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off000119e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119E2 5108 bytes
SHA-256: 286e88f3b95a00cd41bd6e52121e03586545468053ec17c4bba72e15ad7e79d9
font_01_sfnt_off00012b65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B65 11864 bytes
SHA-256: 338fa537edb3f11327736c9016cdbb690af4a8aa911e36b9c570622a7efb0e95

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