Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9cf16eb34cfd748…

MALICIOUS

PDF

37.3 KB Created: 2020-04-11 06:51:12 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: f6505da454fd07099e75dcc7f7e01f89 SHA-1: dee48079dcc4649cbddf7f8b2430e5b97112f0cf SHA-256: a9cf16eb34cfd7487df41e0cf90d6bf4696bf8435fcff8f11e4c069e848c98be
94 Risk Score

Malware Insights

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

This PDF document functions as a link farm, directing users to a large number of external websites. The document's content is minimal, primarily serving as a lure with the text "Organic chemistry questions and answers pdf". The heuristic PDF_SEO_LINK_FARM indicates a deliberate attempt to create a network of linked pages, likely for SEO manipulation or to host malicious content across multiple domains. No scripts were extracted from this sample.

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://brendonsingh.com/uploads/1/3/0/8/130813956/130813956.html#organic+chemistry+questions+and+answers+pdf
    • http://clevelandcareercenter.com/uploads/1/3/0/8/130874067/9812036.pdf
    • http://heybkln.com/uploads/1/3/1/4/131484328/5245284.pdf
    • http://allenssnowremoval.com/uploads/1/3/0/8/130874238/334add65eb2.pdf
    • http://e-dci.com/uploads/1/3/0/5/130539758/podoxaj.pdf
    • http://mustangrentals.us/uploads/1/3/0/4/130476089/jusuzubuziluvowi.pdf
    • http://volkercafe.com/uploads/1/3/1/4/131437116/rikukixefagit.pdf
    • http://halowenamioty.pl/uploads/1/3/0/7/130775756/rixumufejidij.pdf
    • http://dappgen.com/uploads/1/3/0/8/130813524/wumafuravibi.pdf
    • http://heartfieldpilates.com/uploads/1/3/0/5/130538817/3790299.pdf
    • http://peacepoplar.org/uploads/1/3/1/3/131384333/86178d5.pdf
    • http://dadaohou.com/uploads/1/3/0/7/130775361/1878223.pdf
    • http://georgeysbarbershop.com/uploads/1/3/0/5/130590298/a2aaec6a59.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_off00006958.bin
09ae7e2767d3be6d40b971389a0693c9c91661da8f3ccfa48189629d804a2dd8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6958 8248 bytes

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