Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f181abca7665184…

MALICIOUS

PDF

44.8 KB Created: 2020-04-06 09:00:31 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 139c9d1042d65c2752482de07b38e83a SHA-1: 3a892a152c9f0aa5efe8f47ed7b319f6acd8d878 SHA-256: 9f181abca76651844e3bb971f90e74fb7e50ccf9f831da9c34a333256886887c
94 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many of which point to other PDF files hosted on different domains. This behavior is indicative of a link farm or a distribution mechanism for further malicious content. The ML classifier strongly supports the malicious nature of this PDF. The document body itself appears to be corrupted or contains minimal relevant text, making it difficult to ascertain a specific lure.

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://saranlpcoach.com/uploads/1/3/0/3/130313345/130313345.html#counting+atoms+and+writing+formulas+worksheet+answers
    • http://economicstitan.com/uploads/1/3/1/1/131164127/rubijibe-muxafenimaj-bisafafali-manalobuzibu.pdf
    • http://diamondmusicagency.com/uploads/1/3/0/7/130776402/9288403.pdf
    • http://socialrealestateclub.com/uploads/1/3/0/2/130270867/4090409.pdf
    • http://alyssahollandphoto.com/uploads/1/3/0/7/130775866/8127501.pdf
    • http://jimhardina.com/uploads/1/3/0/4/130435738/bimudufo.pdf
    • http://sckatelynham.com/uploads/1/3/1/0/131069899/kazomalevi-dozifabavifuxu.pdf
    • http://theairwebreathe.net/uploads/1/3/0/6/130621591/rozajetu_badivezebed.pdf
    • http://nenanaag.org/uploads/1/3/0/7/130739393/8409029.pdf
    • http://woflcanada.org/uploads/1/3/0/5/130590436/e22d96.pdf
    • http://southernaustraliaservices.net/uploads/1/3/1/0/131070849/tezelikivitokaw.pdf
    • http://neofieldsplanthire.com.au/uploads/1/3/1/3/131379944/bfa41c8.pdf
    • http://ritzel.info/uploads/1/3/0/7/130775294/3fbb2b.pdf
    • http://stevechov.com/uploads/1/3/1/4/131438330/kebutox.pdf
    • http://cpanel.lambersfisher.com/uploads/1/3/0/4/130436298/xezipobaso.pdf
    • http://csgwebtest.com/uploads/1/3/1/4/131438392/kasevoba-timez-rutunaliluku-rexininivuro.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_off0000876c.bin
b8c0e047b035fa3ea8fbefc109808c2b30106ca9c58e1dffc649d44cd1e93c49		 pdf-font-stream PDF embedded font (sfnt) at offset 0x876C 7668 bytes

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