Malicious PDF — malware analysis report

Static analysis result for SHA-256 b439f7dacd57b808…

MALICIOUS

PDF

75.2 KB Created: 2021-06-08 20:27:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: c65f8f56f6c74ad81771be4ef6fabacf SHA-1: 59d9cb2fcf1d9dfa1aad2dd290eaf64b5268f252 SHA-256: b439f7dacd57b808a29303afa2f70fbd96576af9c98318357f2a24fce66714cb
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm designed to redirect users to potentially malicious sites. The primary lure appears to be cracked software, as indicated by the URL parameters.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://crysiq.ru/pbw?utm_term=adobe+photoshop+lightroom+classic+crack PDF link annotation
    • https://ruzojewa.weebly.com/uploads/1/3/4/4/134437104/kubefuf_zopipor_kinomuk_gizoxuv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409246/normal_606a5579469fc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490534/normal_60506bdf1464b.pdfIn PDF document text
    • https://dopovebo.weebly.com/uploads/1/3/4/4/134431975/1210271.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368227/normal_600c0c3775c80.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4374369/normal_60b3dd657d4c5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417429/normal_5feea55bbed84.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424361/normal_60ba93ab65744.pdfIn PDF document text
    • https://xibigulekin.weebly.com/uploads/1/3/0/9/130968960/b6105eb9c5a51.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380700/normal_5fcf1f9d2246e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470226/normal_601c9c364e588.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4463286/normal_5fff57b80096f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382773/normal_605d8e393d211.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468827/normal_5fd3b41b4e739.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kedajawi.pbworks.com/w/file/fetch/144825357/doraxofibozup.pdfIn PDF document text
    • http://sojakun.pbworks.com/w/file/fetch/144733629/to_kill_a_mockingbird_chapter_1-31_questions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4c12903a-4967-42a9-9432-e39f8c26b645/gujesoroxufanoduwitane.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/33976eda-8d59-4ea6-9b5e-62184891ef31/fusul.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/877e7015-10c0-4ca3-b3a8-5eb2594a5094/song_of_solomon_sparknotes_chapter_10.pdfIn PDF document text
    • http://jolunatimavu.pbworks.com/f/ac_origins_silica_cheat_engine.pdfIn PDF document text
    • http://gabumur.pbworks.com/w/file/fetch/144592302/pan_tadeusz_streszczenie_szczegowe_ksiga_11.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_off0000e913.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE913 5680 bytes
SHA-256: fd586031de927320bf13731aa5c651ee9b638485e7086e7ade7d63837130ca49
font_01_sfnt_off0000fc31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC31 10256 bytes
SHA-256: 4f610368a906f6833b4bac3b333b84b6c09ebdbb59df7eb463966f4a980f3d16