Malicious PDF — malware analysis report

Static analysis result for SHA-256 011e47b400cfc728…

MALICIOUS

PDF

28.6 KB Created: 2020-05-13 14:29:20 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: d20cce7b45ddf2595c79751c43590a93 SHA-1: eacc0c18bd887387560edb295e7ee67c1b662ea4 SHA-256: 011e47b400cfc728ca4039587273d50e82e58f8fc2a34d73f5b3a849dfcfd55a
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious File

The PDF document contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various domains. The ML classifier also flagged this PDF as malicious with high confidence. The embedded document body text, though partially obfuscated, includes a URL that aligns with the observed link farm behavior, suggesting a coordinated effort to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 4

  • 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 http://bmajorevents.net/uploads/1/3/1/4/131437677/131437677.html#laboratory+report+14+skull+part+a+assessment
    • http://biomaxresearch.net/uploads/1/3/0/3/130313135/nozototalerosixe.pdf
    • http://benhillcc.org/uploads/1/3/1/6/131606687/getipipiva.pdf
    • http://sci2foundation.org/uploads/1/3/0/4/130435598/8667257.pdf
    • http://brandnamewellness.com/uploads/1/3/0/2/130291489/6d26a.pdf
    • http://learningdailymusic.com/uploads/1/3/0/7/130775917/7844493.pdf
    • http://say-anything-girl.com/uploads/1/3/1/6/131606695/faforadosa.pdf
    • http://keipos.org/uploads/1/3/0/3/130313053/wiwogorajobud.pdf
    • http://szafroncreative.com/uploads/1/3/1/4/131437845/werutijojani.pdf
    • http://cbmstore.com/uploads/1/3/0/6/130620590/vilelofew-bekawinug-xaxumoseguf-forojejofegona.pdf
    • http://alutech-mons.com/uploads/1/3/1/6/131606203/1337878.pdf
    • http://ilemauricelocationdevacances.com/uploads/1/3/0/4/130490444/9881596.pdf
    • http://woundedwarriorwife.com/uploads/1/3/0/5/130588357/2458abe.pdf
    • http://businessbrokerreviews.com/uploads/1/3/1/3/131380788/50fcb.pdf
    • http://nyhavnsbodega.dk/uploads/1/3/0/4/130476083/juvosoxoz.pdf
    • http://mirrorimagemissions.com/uploads/1/3/1/8/131856987/d5b353.pdf
    • http://minrikattic.space/uploads/1/3/0/6/130621432/2282f9b92ddec2f.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004aa4.bin
427767dd1cd1c37b154a4f60eb994d16703b58597cd580e57825e89afca7d998		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4AA4 8276 bytes

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