Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab043f74cb8e08dc…

MALICIOUS

PDF

72.6 KB Created: 2021-02-16 04:13:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: e212318d86e5e8b2885eba795977c5ec SHA-1: ed968b056f11361e24ec7cfdd60c56220c74864c SHA-256: ab043f74cb8e08dc8b84c1b5d678aef96cfc81f61769713535b8a188f319d861
186 Risk Score
Tags
free-cdn-ebook-manual-lure

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://crophysi.ru/strik?utm_term=life+fitness+95ti+treadmill+price PDF link annotation
    • https://lafasajuju.weebly.com/uploads/1/3/4/0/134017903/1939513.pdfIn PDF document text
    • https://rofosuvobatijam.weebly.com/uploads/1/3/4/6/134661532/godabadi.pdfIn PDF document text
    • https://bitujidup.weebly.com/uploads/1/3/4/5/134598072/9962064.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425908/normal_5fe49a1f6539d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366311/normal_5ffa2fe453878.pdfIn PDF document text
    • https://pubotaxo.weebly.com/uploads/1/3/5/9/135962756/sixupuvovo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375196/normal_5fef7cca14df7.pdfIn PDF document text
    • https://zozajiditufex.weebly.com/uploads/1/3/5/3/135309939/wigov_bipulifegobap_dofaso_kuriguxobofin.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384839/normal_6029c99a8ba31.pdfIn PDF document text
    • https://totorososine.weebly.com/uploads/1/3/4/8/134892144/dovililivatuvan.pdfIn PDF document text
    • https://pozufijuxib.weebly.com/uploads/1/3/0/7/130775557/5322790.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382773/normal_5fdbd0ffe5157.pdfIn PDF document text
    • https://jaweditulopo.weebly.com/uploads/1/3/4/3/134313576/5558103.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485446/normal_6026d2430c17f.pdfIn PDF document text
    • https://pexekakuxop.weebly.com/uploads/1/3/2/8/132814074/577499.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/wulotugadag/19855154580.pdfIn PDF document text
    • https://s3.amazonaws.com/luborinizu/aaron_blaise_photoshop_brushes_free.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_off0000dcf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCF8 5520 bytes
SHA-256: 78792049cdb49d51e40a3057669d193f79f7c3c81eaa5f5d960a552f8d7487d8
font_01_sfnt_off0000efb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFB2 11016 bytes
SHA-256: 9f220144cafff734781415ae33710612f441339fbebaac442b349f86e73cd2ee

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