Malicious PDF — malware analysis report

Static analysis result for SHA-256 07a1ee735816f2f4…

MALICIOUS

PDF

29.5 KB Created: 2020-05-04 14:16:16 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: d375c5c31089e182184e1e27e08e492c SHA-1: 88303b819fec874530beee2e3eb39a76d6da3da2 SHA-256: 07a1ee735816f2f4ce0d84a49c8cfd7962141e4f46a7875b55cea2912a8d8792
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links to other PDF files hosted on various domains, identified by the PDF_SEO_LINK_FARM heuristic. The ML classifier also strongly indicated maliciousness. While no scripts were extracted, the sheer volume of outbound links suggests an attempt to manipulate search engine results or distribute malicious payloads indirectly. The document body contains garbled text and what appears to be metadata, but the primary malicious activity is the link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://cityonloc.com/uploads/1/3/1/0/131070387/131070387.html#levers+and+pulleys+worksheet
    • http://westernpathhealingcenter.com/uploads/1/3/0/8/130813860/147971.pdf
    • http://bandandbalm.com/uploads/1/3/1/4/131454396/4d9c02dabd65b6f.pdf
    • http://dayafterkatyn.com/uploads/1/3/0/5/130589346/xetefe_vumab_lasezamariz.pdf
    • http://caix.us/uploads/1/3/0/4/130476456/35af484.pdf
    • http://bradleyandsonsmaintenance.com/uploads/1/3/0/4/130477805/1650454.pdf
    • http://allpahs.org/uploads/1/3/0/7/130775277/2893314.pdf
    • http://cellphonelosangeles.com/uploads/1/3/0/6/130621412/nefizigizege.pdf
    • http://barbarianlabs.com/uploads/1/3/0/8/130874139/4786860.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004ad7.bin
1d36ae8d782b49b567f5737767d3c60298eb85df26020f812d9598a743d89f20		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4AD7 9784 bytes

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