Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ce2641d09bce5c7…

MALICIOUS

PDF

34.0 KB Created: 2020-05-14 22:31:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-12-25
MD5: 53c63a9e38fe10a53322113d5ba60fe0 SHA-1: 3c6c5931840f296600de9bb3ec4fe8a4d1191f4e SHA-256: 6ce2641d09bce5c7cea6555cc6ce126b75e13461e5837465ecabfda01154e947
96 Risk Score

Malware Insights

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

The PDF contains a large number of embedded external links, identified by the PDF_SEO_LINK_FARM heuristic. The ML classifier also strongly indicated maliciousness. The document body, though partially obfuscated, contains URLs that are repeated in the heuristics and the extracted URL list. This suggests the primary purpose is to redirect users to a network of potentially malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://pamfrederickart.net/uploads/1/3/1/8/131871673/131871673.html#free+aphasia+apps+for+android PDF link annotation
    • http://wheels-marketing.com/uploads/1/3/0/7/130738705/kivig-nodaporinof-gifoz.pdfIn PDF document text
    • http://shayalive.com/uploads/1/3/0/2/130289397/9242130.pdfIn PDF document text
    • http://tacomasoutsidersguide.com/uploads/1/3/0/4/130436197/vadirisofulojol.pdfIn PDF document text
    • http://soundherd.com/uploads/1/3/0/4/130476101/26d812d645dcf6.pdfIn PDF document text
    • http://auerservis.com/uploads/1/3/0/4/130488251/2967441.pdfIn PDF document text
    • http://willowpromote.com/uploads/1/3/0/3/130379435/raguwabuduma.pdfIn PDF document text
    • http://akaurcreations.com/uploads/1/3/0/7/130776626/77071a5c65.pdfIn PDF document text
    • http://gabrielmobolaji.com/uploads/1/3/0/6/130621215/wapuwirevijuman_xusepozotofa_kinadole.pdfIn PDF document text
    • http://bluedreamhawaii.shop/uploads/1/3/0/4/130435569/jevaziw.pdfIn PDF document text
    • http://danielaso.com/uploads/1/3/0/8/130874523/3504523.pdfIn PDF document text
    • http://vinaga.org/uploads/1/3/0/7/130738593/fexede.pdfIn PDF document text
    • http://skintagsremoved.com/uploads/1/3/0/2/130272247/digalotizikize.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000057a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x57A3 10836 bytes
SHA-256: 657dae8bd7c931568fd6c81a27a35711eae0a6dafb4871ee2759bfdd7cfcb323

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