Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a08687851f4a5e7…

MALICIOUS

PDF

76.4 KB Created: 2021-04-15 03:36:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: ba01751655884883d399882199297caa SHA-1: d86029c344391551ad960c2eb177cda70a7226aa SHA-256: 8a08687851f4a5e7c6aef93fb18287d36c3b58ad4977b21be546af402f15ac42
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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/strik?utm_term=how+much+does+it+cost+to+have+a+song+mastered PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4420743/normal_6030190aede7b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487197/normal_601b28c7cd761.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482880/normal_600a048c4f079.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425005/normal_60226d0c30a4e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419236/normal_604948768abe4.pdfIn PDF document text
    • http://fuxuxixigu.scienceontheweb.net/kimedago.pdfIn PDF document text
    • http://pafowitowa.medianewsonline.com/little_do_you_know_guitar_chords.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://2987c0f4-171e-4473-b3f1-a5468658115b.filesusr.com/ugd/75ff8a_7070877a7fc14c538fd27da245a1d601.pdf?index=trueIn PDF document text
    • https://50aad03f-9d2a-47e6-be13-abd12f321b17.filesusr.com/ugd/3fd638_ddd02151f3e84843b02821f828ab37e2.pdf?index=trueIn PDF document text
    • https://a0d2adcf-75bd-42a9-a42a-c23e1c6e9e1a.filesusr.com/ugd/85c99c_5e16370325d8434b85a864deb3b452fe.pdf?index=trueIn PDF document text
    • http://girofili.myartsonline.com/how_to_get_merit_badges_fast.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/317b7ce1-6d9b-4f85-9811-5258db9d2316/tukuluzogipuza.pdfIn PDF document text
    • https://s3.amazonaws.com/wuvepilamamuse/how_much_does_a_navy_hm_make.pdfIn PDF document text
    • https://s3.amazonaws.com/memobofilenabon/3946860415.pdfIn PDF document text
    • https://s3.amazonaws.com/jezekemunidup/43947510877.pdfIn PDF document text
    • https://s3.amazonaws.com/xomepixo/integral_calculus_feliciano_and_uy.pdfIn PDF document text
    • https://50fe66f1-00be-429c-ab6c-57a9f80d6ab9.filesusr.com/ugd/39cb9d_409ebab8073b4cd2b47bba71ff91c65a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/525cf1e2-a2c8-4c5b-951c-66b34c78ee7a/instructions_for_lux_tx500e_thermostat.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB21 5436 bytes
SHA-256: 5780f1755080d19190f232390f25cf950feb1bd5ce324743e5cf58d429263112
font_01_sfnt_off0000fd87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD87 11416 bytes
SHA-256: b17284204a3be3708318b2e10f813b108625da9681871a402e3dcb4107fc505b

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