Malicious PDF — malware analysis report

Static analysis result for SHA-256 0cbaa6d08569c12f…

MALICIOUS

PDF

78.1 KB Created: 2021-03-03 10:47:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 113cfe0befdf136c604ab64860e3b7e8 SHA-1: 854882b564e54913a651fbf1eb6675a04e089860 SHA-256: 0cbaa6d08569c12f516878f74dc9b66383c84870107ca35877638e2a6307e42f
126 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many hosted on disposable domains, suggesting a link farm or redirection scheme. The ML classifier strongly indicated maliciousness. While no scripts were explicitly extracted, the PDF structure and embedded URIs point towards an attempt to redirect users to potentially malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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 https://golowaki.ru/strik?utm_term=how+to+sell+trading+cards+online PDF link annotation
    • https://bimenejujuw.weebly.com/uploads/1/3/4/5/134592033/4f785c9421.pdfIn PDF document text
    • http://bekowakiged.iblogger.org/alcides_ramon_magana.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417037/normal_5fd9dc64a3903.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4496818/normal_5fec405da3895.pdfIn PDF document text
    • https://paludiwebi.weebly.com/uploads/1/3/4/0/134012690/1b946b538.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386829/normal_5fe287e0b5de2.pdfIn PDF document text
    • https://lugejalafomap.weebly.com/uploads/1/3/4/8/134884490/duxapi-fikimalamuralu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460066/normal_6024551ba5305.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495976/normal_5ffab2288db74.pdfIn PDF document text
    • http://vupikevuga.iblogger.org/16743191531.pdfIn PDF document text
    • https://xapezojukigese.weebly.com/uploads/1/3/1/4/131453407/2849367.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481068/normal_6018cf084c409.pdfIn PDF document text
    • https://wupanotowi.weebly.com/uploads/1/3/1/4/131406855/zutinalujukovo.pdfIn PDF document text
    • https://nixawajumumija.weebly.com/uploads/1/3/4/3/134338940/govivetesoxi.pdfIn PDF document text
    • http://famozosivupiwij.sportsontheweb.net/how_to_get_share_the_wealth_cards_in_life.pdfIn PDF document text
    • https://tadinitalu.weebly.com/uploads/1/3/4/7/134744808/fowujodusipogid_tabenaruneka_moreg_xodedin.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487413/normal_6018a811a38b1.pdfIn PDF document text
    • http://dotixomovi.sportsontheweb.net/29374165573.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://teluroluxeterez.myartsonline.com/software_testing_course_fees_in_seed_infotech_pune.pdfIn PDF document text
    • http://famojubosaved.rf.gd/wibutafajogukew.pdfIn 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f494.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF494 5160 bytes
SHA-256: 7f2373dc4fd085e4e1ff2b731e64b9ea815cf67df53f13eb624f6455253f3c00
font_01_sfnt_off00010641.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10641 10788 bytes
SHA-256: eeb41dccead82efbf0ff967d40d57b25cfc35d6bc924372d09fa03c3981f94b9

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