Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ec658bef07b6c75…

MALICIOUS

PDF

78.7 KB Created: 2021-03-05 09:22:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: a4b01c6543b1bfd00f35cdb69cf9c3c8 SHA-1: 15348641f0de065cc59ba04a802cb58d8d7cb13e SHA-256: 2ec658bef07b6c75a5957547be4775a15cfa189df9f6f33414347c67f77c746f
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm designed to redirect users to potentially malicious content. The ClamAV detection and ML classifier strongly suggest this is a phishing or malware distribution attempt. While no scripts were explicitly extracted, the nature of the link farm suggests it's intended to lure users to sites that may host exploits or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://bologen.ru/strik?utm_term=lights+out+2013+movie PDF link annotation
    • https://lefesime.weebly.com/uploads/1/3/4/8/134882546/8900555.pdfIn PDF document text
    • http://ing-cliente.com/class_dojo_free_for_laptopx82ir.pdfIn PDF document text
    • https://xuxurebero.weebly.com/uploads/1/3/4/6/134673100/615078a175fd0c6.pdfIn PDF document text
    • http://bottlechainworld.com/1479715150909t6.pdfIn PDF document text
    • https://ginugifugebiner.weebly.com/uploads/1/3/4/2/134234672/jibukelova.pdfIn PDF document text
    • http://revershjtb.site/35754403376kl6ut.pdfIn PDF document text
    • http://jabilevij.mypressonline.com/what_temperature_should_my_whirlpool_fridge_be_at.pdfIn PDF document text
    • http://flipping-car.online/javemixagazerfdqv.pdfIn PDF document text
    • https://pexafibilo.weebly.com/uploads/1/3/4/4/134484824/ffb9e6812cd69bd.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://c8070bf9-ed42-4c5d-8eb8-ca35ee70f136.filesusr.com/ugd/d38238_0ff511535807442aa67a5cd8df23e510.pdf?index=trueIn PDF document text
    • http://tososite.onlinewebshop.net/43504546587.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/73d29284-242e-4907-a3e4-75d44858dd0f/whirlpool_duet_washer_will_not_drain_or_spin.pdfIn PDF document text
    • https://6f2fb29c-15f2-4b08-b525-3eb91a7f0a41.filesusr.com/ugd/c3548c_b9f361619ded4eaba762c31d014c6f90.pdf?index=trueIn PDF document text
    • http://bumejefivoxigo.myartsonline.com/kuwugedotebijuxovufozojel.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b7189feb-9424-4da1-9d03-2b264913a701/doorking_1810_parts.pdfIn PDF document text
    • https://ad0d0dbb-669b-46a9-85df-79487014a0f3.filesusr.com/ugd/00d95d_a35f274ed9be48f3bed626353fb29718.pdf?index=trueIn PDF document text
    • http://gutekuretejapoj.onlinewebshop.net/blank_outline_map_of_the_world_to_print.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b18a01f8-182c-4d60-9f8a-07b87da03a16/xorevugulozaravesi.pdfIn PDF document text
    • https://626fb5af-1d67-41cb-86ce-204163677ff0.filesusr.com/ugd/9d869b_e0e63da36b384a34a0b7f2a11b55ed39.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a82461bc-4aa7-493e-9cb7-26e61ddce0f4/how_to_make_your_own_jelly_roll_for_quilting.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_off0000f7ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7ED 5252 bytes
SHA-256: be9483c50fbf30fbfbf31ec0acc792e370c89e7def727d970deabce5518818f6
font_01_sfnt_off000109c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109C6 10644 bytes
SHA-256: a6323b054f6cc7dcc7aac230efc05a4277e6120bf262dddea7413f87cc6fdd58