Malicious PDF — malware analysis report

Static analysis result for SHA-256 34e55506952df230…

MALICIOUS

PDF

51.7 KB Created: 2020-05-18 04:23:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cc1dbbc91d3244dd25aa4897bb0c3efe SHA-1: ad67e4054022609fdea53d9c15e7e88c3ab00f46 SHA-256: 34e55506952df230b7642dc67473413a144d674ddd598cc6c60a98e64905dd73
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.001 PowerShell

This PDF document exhibits characteristics of a link farm, containing numerous external links to various domains. The primary heuristic, PDF_SEO_LINK_FARM, indicates a mass of external PDF links, suggesting a tactic to manipulate search engine results or distribute content across many sites. The ML classifier strongly supports the malicious nature of this PDF. The embedded URLs are likely part of this link farm strategy, potentially leading to further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://puttylove.com/uploads/1/3/0/6/130621960/130621960.html#neoplasia+pathology+notes+pdf
    • http://hguadolor.com/uploads/1/3/1/3/131380404/josugunovox_tiludisutilokin_somova.pdf
    • http://exspace.ca/uploads/1/3/1/8/131872105/6504753.pdf
    • http://fbhamilton.org/uploads/1/3/1/4/131406544/515d3893488.pdf
    • http://wakeupamericacampaign.com/uploads/1/3/1/8/131856266/kakor_wasaxuvit_gofarufabosawep.pdf
    • http://photomateo.com/uploads/1/3/0/6/130639214/sojelava.pdf
    • http://momsonboard.org/uploads/1/3/0/6/130639220/katerijabisu-gakod.pdf
    • http://proficient-services.com/uploads/1/3/1/0/131070674/475ef1eb.pdf
    • http://twangandtwig.com/uploads/1/3/0/5/130550890/4477467.pdf
    • http://nickstatham.com/uploads/1/3/0/6/130621071/kinodijizogevu-xapekejifemabo-lisoxekedudiso-xuberawage.pdf
    • http://manuelarielcalderon.com/uploads/1/3/0/7/130774969/8f98464229a.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_off00009edc.bin
d83f2c551c31fc4f550a17eb4250081aef45efcff7600ad6ea3333022bda00b6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9EDC 10740 bytes

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