Malicious PDF — malware analysis report

Static analysis result for SHA-256 a14a3885a11bf70e…

MALICIOUS

PDF

103.2 KB Created: 2020-11-24 09:54:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 727edbd38a09a49b512d271628b40cc5 SHA-1: 81384b0778f11cd0ec58bf38074664c94c6e2c6a SHA-256: a14a3885a11bf70e891d56e42f4108687a0304a9b523e16eee211504bff555a7
156 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 5

  • 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.
  • 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=cub+scout+leader+names PDF link annotation
    • https://kokexofagisukop.weebly.com/uploads/1/3/2/7/132710589/6172749.pdfIn PDF document text
    • https://pevugubak.weebly.com/uploads/1/3/2/7/132740457/penodiw-tiregolugu-vafas.pdfIn PDF document text
    • https://kamejufozafa.weebly.com/uploads/1/3/4/8/134891268/848119.pdfIn PDF document text
    • https://nolemidu.weebly.com/uploads/1/3/4/5/134584078/53cc44b53.pdfIn PDF document text
    • https://niraniki.weebly.com/uploads/1/3/4/6/134662237/8587459.pdfIn PDF document text
    • https://niwejeru.weebly.com/uploads/1/3/4/3/134308800/siwejutifub.pdfIn PDF document text
    • https://xoxebugifujame.weebly.com/uploads/1/3/4/4/134478015/d6903d47d6.pdfIn PDF document text
    • https://gixodavo.weebly.com/uploads/1/3/4/6/134632057/5137851.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/vapite/bellyache_billie_eilish_violin_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/lakujusitejojet/american_heart_association_statin_guidelines_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/bulikowexunepov/foranagenejevaran.pdfIn PDF document text
    • https://s3.amazonaws.com/wekibik/44869903136.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_off000158d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x158D2 5128 bytes
SHA-256: cdf49495579e191db658bcf5bc36216c0ad06ee1ab7040974ddbee3312e7f1df
font_01_sfnt_off00016a23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16A23 11092 bytes
SHA-256: eca6c689ea328429525228c7885a1c41fcfe85539dff54aa2eac073f09f5c437