Malicious PDF — malware analysis report

Static analysis result for SHA-256 376acbe877b0dde1…

MALICIOUS

PDF

40.5 KB Created: 2020-03-11 13:15:09 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: cb15b05347822ab0b7fb94386e3c78ab SHA-1: a627a6ef4e8221682e53ec96679c8a6c86d16651 SHA-256: 376acbe877b0dde12ee725c0150ddb540758821f079dd13b89bf88f93836e423
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 to other PDF files hosted on various domains, indicating a link farm or SEO poisoning attempt. The ML classifier strongly flagged this PDF as malicious. The embedded URLs are the primary indicators of malicious activity, suggesting the document's purpose is to redirect users to potentially harmful content.

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://yaredimmtratax.com/uploads/1/3/0/4/130435729/130435729.html#alphabet+tracing+activities+for+preschoolers
    • http://miradio809.com/uploads/1/3/0/4/130436108/lezakuninu.pdf
    • http://doctorberrycoaching.com/uploads/1/3/0/4/130488248/bosobasit-zozavif-wijuvut-kiwetivoda.pdf
    • http://etnapark70.com/uploads/1/3/0/3/130379118/bc7a0835a2f6.pdf
    • http://2051551albertaltd.com/uploads/1/3/0/2/130289803/4e4d1c45c11a.pdf
    • http://cryptoorfx.com/uploads/1/3/0/6/130620439/7908742.pdf
    • http://allveteransmemorialpark.org/uploads/1/3/0/6/130621481/08c32b39.pdf
    • http://www.mitchheaslipfitness.com/uploads/1/3/0/7/130740392/xexolevotad-xusimirut.pdf
    • http://westernregionsamplescourier.com/uploads/1/3/0/5/130588473/sivunati-vepugi.pdf
    • http://qutisatelier.com/uploads/1/3/0/2/130270775/peliwimomefozi.pdf
    • http://408br.bpmtc.com/uploads/1/3/0/5/130539114/6787632.pdf
    • http://www.mourntolight.com/uploads/1/3/0/4/130483848/6741012.pdf
    • http://evabuxeda.com/uploads/1/3/0/5/130550794/7c5078.pdf
    • http://hairbyjonathan.com/uploads/1/3/0/6/130620519/7663851.pdf
    • http://hitmebackgreetings.com/uploads/1/3/0/6/130604114/nasunuxepifu-fezuxitukuwo.pdf
    • http://mckinleysstation.com/uploads/1/3/0/5/130590058/dewukeg.pdf
    • http://www.eshooop.it/uploads/1/3/0/7/130775529/81c244ab9.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_off000075cb.bin
e4d63468ac2097a68b6ec1a0f0f200bb84a3fd4c73cf57680aba219ab440e96c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x75CB 7952 bytes

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