Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcf482fd823b861f…

MALICIOUS

PDF

70.7 KB Created: 2020-11-13 01:40:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 8a1de5ccab4fb21eb08ff253ad1c165b SHA-1: 9127c99b764d9e64c8a6e703a37f52ff629f2d3e SHA-256: dcf482fd823b861f40e0e24c51ee64d68f24a17a47b9dd1343ca2694504e01ec
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://traffset.ru/strik?utm_term=aunt+hetty+on+matrimony PDF link annotation
    • https://takijotirodone.weebly.com/uploads/1/3/1/6/131637658/d431a96.pdfIn PDF document text
    • https://gimejexoxixaza.weebly.com/uploads/1/3/1/8/131872185/wotareropajewub.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371261/normal_5f938a3561061.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366008/normal_5f87224281b4a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373511/normal_5f89c22fd0c2a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444351/normal_5fa001eadea08.pdfIn PDF document text
    • https://firedisivimi.weebly.com/uploads/1/3/0/9/130969818/godoto-jubovebivowoze.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366311/normal_5f93ad9c2d633.pdfIn PDF document text
    • https://gevafitasib.weebly.com/uploads/1/3/1/3/131380901/e27909d0be.pdfIn PDF document text
    • https://tifedufuzitiji.weebly.com/uploads/1/3/4/3/134353288/fevikovo_xewuwexo_mulufa_kobazuza.pdfIn PDF document text
    • https://pofewapat.weebly.com/uploads/1/3/4/0/134018592/mojinejaboduzodutu.pdfIn PDF document text
    • https://naxedomabaxa.weebly.com/uploads/1/3/1/6/131606472/kulezewutabutitew.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/numegubowalonan/xedipanokokez.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_off0000d9c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9C9 4804 bytes
SHA-256: 76860e7255112151bd1c1477ed2a571e412b572c97a0a68c5d3b452473894ed7
font_01_sfnt_off0000e9f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9F8 10684 bytes
SHA-256: 26831a4ecfb95af414b551788a6dbdc9d312e2981666fe9ecc119d20d83bd09a