Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a0cd7fd3f85aaa4…

MALICIOUS

PDF

36.5 KB Created: 2020-04-04 16:29:40 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: f4a41478ad268c4defd70b067976af72 SHA-1: 6217a198c1cb874248e9dcaa029671cc941f8dd4 SHA-256: 3a0cd7fd3f85aaa43a2d473f79b2ce1bd5ea8c45fbb4711b6bfd065e340175c9
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external links, many of which are numerically or generically named, indicating a link farm or SEO abuse tactic. The primary lure appears to be 'Read cress online free pdf', directing users to external sites that likely host malicious content or phishing pages. The ML classifier strongly supports the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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://jolind.org/uploads/1/3/1/3/131398242/131398242.html#read+cress+online+free+pdf
    • http://foodsafetysolutionsllc.com/uploads/1/3/0/7/130738541/1f75a0a68cd11.pdf
    • http://studentworshipcollective.com/uploads/1/3/0/6/130639282/bomexeliromopufed.pdf
    • http://findhardcover.com/uploads/1/3/0/6/130605482/feduji-fumapu.pdf
    • http://kuniusedcars.com/uploads/1/3/0/4/130483341/d7d5275af23.pdf
    • http://cosmosit.net/uploads/1/3/0/5/130590507/7224844.pdf
    • http://miandhepiano.ca/uploads/1/3/0/6/130605059/ruvex-batopujekamin.pdf
    • http://detroitmobilenotary.com/uploads/1/3/0/9/130969114/juxegowufunir.pdf
    • http://jnickerson-imagery.com/uploads/1/3/1/3/131378968/b25d1ad.pdf
    • http://lisamichellerougeau.net/uploads/1/3/0/4/130488153/5043185f2ac9d4.pdf
    • http://advantageeyecare.info/uploads/1/3/0/7/130775828/6232484.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_off000067df.bin
7642162acbd0e32147c39169f067c2406eaa6a185eb62e7994f81bf245b68345		 pdf-font-stream PDF embedded font (sfnt) at offset 0x67DF 7564 bytes

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