Malicious PDF — malware analysis report

Static analysis result for SHA-256 28d4f305b5178ae1…

MALICIOUS

PDF

37.3 KB Created: 2020-06-05 10:31:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: de2fec7f122f3acf0d3d59782d6df17d SHA-1: ae2f119768a064736f84ef801f0a3e5f0684d244 SHA-256: 28d4f305b5178ae1f62049244e7444814517ac95f890f80bee766f01c01cc3d8
94 Risk Score

Malware Insights

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

The PDF contains a large number of external links to various domains, indicating a link farm strategy. The ML classifier strongly flagged this PDF as malicious. The primary attack pattern involves directing users to a network of related URLs, likely for SEO poisoning or to serve additional malicious content. No scripts were extracted from this sample.

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://stratford-hvac.com/uploads/1/3/0/5/130589132/130589132.html#proper+care+and+feeding+of+husbands
    • http://group78.com/uploads/1/3/0/8/130873851/5679861.pdf
    • http://shinerpork.com/uploads/1/3/0/3/130379506/8658621.pdf
    • http://animalhealingartsbrooklyn.com/uploads/1/3/1/4/131454158/feb2d502b9a32f3.pdf
    • http://pacificperformancecoaching.com/uploads/1/3/0/3/130323249/53e0812b334d4b.pdf
    • http://talkingaboutart.org/uploads/1/3/1/4/131405956/govojijozamefitij.pdf
    • http://sandaliascharmosas.com/uploads/1/3/1/4/131437307/vafelobid.pdf
    • http://stratford-hvac.com/uploads/1/3/0/5/130589132/terms.html
    • http://stratford-hvac.com/uploads/1/3/0/5/130589132/dmca.html
    • http://stratford-hvac.com/uploads/1/3/0/5/130589132/policy.html
    • https://fulivamata.files.wordpress.com/2020/06/4736454150.pdf
    • https://fimutuzufoko.files.wordpress.com/2020/06/44331479099.pdf
    • https://kunemepor.files.wordpress.com/2020/06/wulopaf.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/

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000654f.bin
0949c1a630e38ca8ae65b256f948fa613810c5f9c357371160936010e20c2c18		 pdf-font-stream PDF embedded font (sfnt) at offset 0x654F 10740 bytes

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