Malicious PDF — malware analysis report

Static analysis result for SHA-256 01876accf9221f28…

MALICIOUS

PDF

83.1 KB Created: 2021-02-28 10:04:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: f5b704471fc94ec2dbebcb4d9fc0ba7e SHA-1: b3cb63867400cf1cee54b0b68dda3107d9661532 SHA-256: 01876accf9221f2891be28a854157eecf11c4fc9e633ab80df34acbe44ac3693
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation tactic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to phishing or malware hosting sites. Although no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of a malicious document designed to lead users astray.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://nipisod.ru/123?utm_term=weber+spirit+e-310+gas+grill+dimensions PDF link annotation
    • https://vidatizotasajad.weebly.com/uploads/1/3/4/0/134017381/wokibagufo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458413/normal_601e65655f6ac.pdfIn PDF document text
    • https://cdn.sqhk.co/gidulikegel/BLhdU58/relibufukil.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393772/normal_6008e7cdc8774.pdfIn PDF document text
    • https://cdn.sqhk.co/bexutavukaro/aLj8Axb/cartoon_channel_list_airtel_dth.pdfIn PDF document text
    • https://moforikegumiret.weebly.com/uploads/1/3/2/6/132680993/2520472.pdfIn PDF document text
    • https://vutavevivusupe.weebly.com/uploads/1/3/0/7/130776898/texubitijux-xurexotafuja-giduxubejedas-lusun.pdfIn PDF document text
    • https://cdn.sqhk.co/sadirorig/C0iwjbz/trending_english_songs_2019_list.pdfIn PDF document text
    • https://cdn.sqhk.co/bikegola/jX5DOvp/printable_to_do_list_to_do_list_template.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://sukokovevaz.atwebpages.com/character_sketch_of_johnny_in_the_ransom_of_red_chief.pdfIn PDF document text
    • http://tulufuparogig.epizy.com/dawugupinewon.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f5ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5CA 5608 bytes
SHA-256: 76652db458a491e4e9aa8ef384c31007d45991e80e4b5a9be16fdd96b9065bb4
font_01_sfnt_off000108d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108D0 11572 bytes
SHA-256: b6ea0858a4b8882cc3acb3e983a994037834a62b9adc0b27dd2334b2d0450b4b
font_02_sfnt_off00013022.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13022 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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