Malicious PDF — malware analysis report

Static analysis result for SHA-256 93affc2c06347b18…

MALICIOUS

PDF

74.8 KB Created: 2021-02-27 19:09:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d373fdbaf85bdf5fc1df44e73e5a3660 SHA-1: dbf67a2e369a0080d84d8582285e2d22690fa282 SHA-256: 93affc2c06347b187ea6f771d34f81a2c2093b55b8432f089e4c186843330f19
156 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a malicious intent to redirect users. The ML classifier and ClamAV detection strongly indicate maliciousness. While no scripts were explicitly extracted, the presence of embedded URIs and the nature of the PDF_SEO_LINK_FARM heuristic point towards a phishing or link-farming attack vector, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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=in+what+ways+does+god+reveal+himself
    • https://cdn.sqhk.co/punipopi/fYNjbje/fedibusazazusa.pdf
    • https://sizamuvexiluti.weebly.com/uploads/1/3/4/6/134644091/9d5b0f75c.pdf
    • https://pituluwo.weebly.com/uploads/1/3/1/4/131437949/mejufib_wowit.pdf
    • https://cdn.sqhk.co/bufudoraxala/aVgdhir/62955877039.pdf
    • https://cdn.sqhk.co/josipinu/ejaQN7x/super_clone_rolex_uk.pdf
    • https://babaperivagam.weebly.com/uploads/1/3/1/3/131379833/likapuremowevow.pdf
    • https://wojopegoguw.weebly.com/uploads/1/3/4/6/134690206/wedalu_riwexirez_kodututor.pdf
    • https://cdn.sqhk.co/zevinikiwi/FDidUiI/video_editing_sound_effects_music.pdf
    • https://cdn.sqhk.co/varomapit/ighggfA/sling_tv_apple_tv.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/pivetuzadujo/8774044544.pdf
    • https://s3.amazonaws.com/jolunenafobuw/mousehunt_rift_guide.pdf
    • https://s3.amazonaws.com/sezewu/sasakaw.pdf
    • https://s3.amazonaws.com/gimufesajo/kufegokabareludiragagib.pdf
    • https://s3.amazonaws.com/firigugixujotov/pedumi.pdf
    • https://s3.amazonaws.com/bisapovepizaj/acrobat_9_pro_trial.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e62c.bin
ec0feda9600f3420ac67e86e257388ce6387550af83ce9fc59d808c6a09c8c9c
pdf-font-stream PDF embedded font (sfnt) at offset 0xE62C 5512 bytes
font_01_sfnt_off0000f8e2.bin
02c494f5c7c78a996cec0a7dd735b56972ad8a7bb3fbd56b42156b5815f10c80
pdf-font-stream PDF embedded font (sfnt) at offset 0xF8E2 11204 bytes