Malicious PDF — malware analysis report

Static analysis result for SHA-256 a71ff4fb7532441d…

MALICIOUS

PDF

45.0 KB Created: 2020-04-13 07:40:23 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 35fe5961bd1e930406fa156e882d387f SHA-1: e6d284e10a4cbe979f3e80ee56b08352dbcc572e SHA-256: a71ff4fb7532441d379f0350b58eea93e0b07a74bd02e30815cc3ee1289ebe1f
94 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier as malicious. Static analysis revealed it functions as a link farm, containing numerous external URIs pointing to various domains. The primary heuristic indicates a mass external PDF link farm, suggesting the document's purpose is to redirect users to potentially harmful content. No scripts were extracted, but the structure and heuristics strongly suggest a malicious intent to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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://countrygirlcityways.com/uploads/1/3/0/3/130323219/130323219.html#mr+blue+sky+guitar+tab+solo
    • http://sistersofsanctuary.org/uploads/1/3/0/6/130603803/lavakuj.pdf
    • http://shearerlifestylesolutions.com/uploads/1/3/0/6/130605289/68846db263903.pdf
    • http://southernsistersfancylinens.com/uploads/1/3/0/6/130640091/3fc11.pdf
    • http://adamsoldit.com/uploads/1/3/0/8/130814112/tafineguki_jujumirofo_xedodebegideri_xitazija.pdf
    • http://vancouvervacationrentals.org/uploads/1/3/1/3/131382673/gaxebowakisop.pdf
    • http://andrewlearforcitycouncil.org/uploads/1/3/0/6/130639082/1643454.pdf
    • http://cerdashalal.com/uploads/1/3/0/4/130436236/sapikavezimewalo.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_off0000870c.bin
69fed9517f6a8674b7f0e42c507ad6ec3e151c62f2b55f71b57be7e6830bb699		 pdf-font-stream PDF embedded font (sfnt) at offset 0x870C 8656 bytes

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