Malicious PDF — malware analysis report

Static analysis result for SHA-256 be1cd06f5ae4dafe…

MALICIOUS

PDF

77.9 KB Created: 2021-04-08 20:46:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: bc6a1e0254934e0f6ecdc85055a00203 SHA-1: 280f8a9edcea5a56a0bcc8da242d0d2a28a5aafe SHA-256: be1cd06f5ae4dafe9b2f3764f5543a04d52c944dce154ce066274f462e9b516b
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or distributing further malware. The embedded URLs and the nature of the link farm point towards a tactic to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://golowaki.ru/strik?utm_term=que+es+un+oso+panda+en+china PDF link annotation
    • https://boxesagako.weebly.com/uploads/1/3/4/5/134589877/1731.pdfIn PDF document text
    • https://fumaletaseker.weebly.com/uploads/1/3/1/3/131381433/80b009a86.pdfIn PDF document text
    • https://wojawodexof.weebly.com/uploads/1/3/4/6/134673733/9652093.pdfIn PDF document text
    • https://ziriponu.weebly.com/uploads/1/3/2/6/132696112/c157e577df4.pdfIn PDF document text
    • http://bt-management.website/92675532618ktv8c.pdfIn PDF document text
    • https://xabanemexe.weebly.com/uploads/1/3/4/4/134443602/9698019.pdfIn PDF document text
    • https://morogixifidogaj.weebly.com/uploads/1/3/4/4/134497599/ac978a43acbdc.pdfIn PDF document text
    • https://bipinudaw.weebly.com/uploads/1/3/4/7/134718108/477867.pdfIn PDF document text
    • http://pasiworuwiwoz.getenjoyment.net/xijapesikevedomemuvas.pdfIn PDF document text
    • https://nifonafepo.weebly.com/uploads/1/3/5/3/135319448/nenuwofawutivejowupi.pdfIn PDF document text
    • https://sikowegapewabi.weebly.com/uploads/1/3/5/9/135975971/3043866.pdfIn PDF document text
    • https://wafewukim.weebly.com/uploads/1/3/5/3/135399971/2657b.pdfIn PDF document text
    • https://taxajoberaruvu.weebly.com/uploads/1/3/4/3/134320235/lamirixumobaje_sebulepuju_tudajip.pdfIn PDF document text
    • http://infonewsuk.site/63806160488v3lse.pdfIn PDF document text
    • https://kinifuromokemo.weebly.com/uploads/1/3/5/3/135348191/13a63a5.pdfIn PDF document text
    • http://workmonster.net/finuxpz90r.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wuwedilejom.myartsonline.com/personal_branding.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/16a57964-5a68-49e1-8aa6-0f44bfd7e4e1/mosolirurapifibikigite.pdfIn PDF document text
    • http://zorijefugixor.atwebpages.com/journey_to_the_west_3_full_movie_in_hindi_dubbed_watch_online.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b1053262-3348-4ec3-9c6b-2fe1da77cb6d/what_would_cause_a_dryer_to_not_spin.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3aeae28f-e65a-4c7d-a120-5d7820de6ce2/how_much_potassium_is_in_100g_sweet_potato.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c11be696-b7f8-417f-9394-e4e29009986d/can_you_make_biscuits_with_bisquick_pancake_and_waffle_mix.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_off0000f28f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF28F 5096 bytes
SHA-256: c6e18b068fe889bff4e591695e651eecad9b1d75024b4057d1c0fb0c08ead0de
font_01_sfnt_off000103e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103E1 11132 bytes
SHA-256: d92ec630fb36c6ca1a12db0faeaa49c2b56fb7c3f018db3e2384d7eadf29569d