Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f4277851777690f…

MALICIOUS

PDF

90.5 KB Created: 2021-05-07 17:40:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 2bf5cad2b67fa41777c4770d1f0eb643 SHA-1: cdd3b1aaeb54e5bc2d4841d003de47d79368f92d SHA-256: 3f4277851777690fa416da69255b777422bbd02136ae48e23f824f823c8b3281
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, suggesting a link farm designed to distribute malicious content or conduct phishing. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of a phishing or malware distribution campaign, likely initiated via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jottigo.ru/strik?utm_term=series+rlc+resonance+circuit+lab+report PDF link annotation
    • https://rokojilezel.weebly.com/uploads/1/3/2/3/132302907/jatofe.pdfIn PDF document text
    • http://wowitaly.space/624312608844u4ul.pdfIn PDF document text
    • http://subfamjtii.site/701890774754eshj.pdfIn PDF document text
    • https://ganulexotugoris.weebly.com/uploads/1/3/1/1/131164012/c9a3aa12af313.pdfIn PDF document text
    • http://zugapuvu.mywebcommunity.org/barriers_to_effective_communication_ppt.pdfIn PDF document text
    • https://xezevatev.weebly.com/uploads/1/3/4/7/134730214/zanipozasumeropoma.pdfIn PDF document text
    • https://burigazipe.weebly.com/uploads/1/3/4/7/134764527/35442e7a4a01524.pdfIn PDF document text
    • https://ziresaro.weebly.com/uploads/1/3/4/5/134509830/f802ca1cd73ea1b.pdfIn PDF document text
    • http://lamakexo.scienceontheweb.net/epson_wf-2530_printer_wont_print.pdfIn PDF document text
    • http://tehnikator.ru/komunodisujefizakuxiboagyw5.pdfIn PDF document text
    • http://form-copyrightservices.com/37762314359tic5u.pdfIn PDF document text
    • https://fudukonuxevefez.weebly.com/uploads/1/3/4/6/134606022/vinumuk-xexaxarofumo-javijekukosi.pdfIn PDF document text
    • https://ligiponofejejo.weebly.com/uploads/1/3/4/3/134346234/1324634.pdfIn PDF document text
    • http://vash-fasad.live/patriotism_here_meaning_in_urdu7z32s.pdfIn PDF document text
    • http://jisuvakuwiraza.medianewsonline.com/exemple_attestation_de_travail_maroc.pdfIn PDF document text
    • http://rowaxamapitowej.getenjoyment.net/60720371602.pdfIn PDF document text
    • https://risogaruwakev.weebly.com/uploads/1/3/4/6/134634919/tumina-redisiwu.pdfIn PDF document text
    • https://fidurelofomus.weebly.com/uploads/1/3/0/7/130740547/nuzupawosi-bibefojovevobe-pakep.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mawidinivetobi.myartsonline.com/arduino_crash_course.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5fb96b95-32eb-4666-acce-2607345a95a8/harmony_booster_seat_instruction_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/821e87d0-561e-49d2-9c23-c9513093df42/todizetevonusara.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2b6a2f2d-f04c-47f1-99f7-025ac771cebf/17273424754.pdfIn PDF document text
    • http://dirulibas.onlinewebshop.net/blender_2._79.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e0306a02-6301-4753-bef8-1e81438ccf16/86011790352.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010a12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A12 5168 bytes
SHA-256: 2fb0028e39c69f64ca2e39eb6f640efa0a3ee6a7b28a82fc5b9c3d6f772379bf
font_01_sfnt_off00011bae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BAE 12716 bytes
SHA-256: 464a488c800c4e3085a97b133b9b8b958b5621cf81bb749a7b6c689c3a417e28
font_02_sfnt_off0001475b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1475B 16072 bytes
SHA-256: 4ce97752c8d1ed0b0302a1507788019c6b738cc3ee96ca273f61f92c287db7cd