Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5d0b878d03b03bb…

MALICIOUS

PDF

86.6 KB Created: 2021-04-28 20:52:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6a528116a61b1ace54a3f9b514ce2bce SHA-1: 9a7203f437d673708ce19521be6feb4d3edb8baa SHA-256: f5d0b878d03b03bb087c312995d9ef7dfabfb4dbbdecb385a88e2a46f6072ec9
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO spam operation. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external links point towards an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

Heuristics 6

  • 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.
  • 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 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://botokaw.ru/strik?utm_term=cabela%2527s+160-liter+commercial-grade+food+dehydrator+reviews
    • https://goxatuzibifonev.weebly.com/uploads/1/3/0/7/130739188/roxavegemata_temunir_rixobewor_dazowarugofuruk.pdf
    • https://muwalivom.weebly.com/uploads/1/3/2/6/132695892/lonoxilikovetu.pdf
    • https://wawumojobov.weebly.com/uploads/1/3/5/3/135323155/5965867.pdf
    • https://xabonawof.weebly.com/uploads/1/3/5/9/135965837/xitofufaziwudefaviwa.pdf
    • https://lasakewozazewa.weebly.com/uploads/1/3/1/4/131437605/2140073.pdf
    • https://detazemunowovi.weebly.com/uploads/1/3/4/7/134704720/1b60cd.pdf
    • https://cdn.sqhk.co/gizivapejoko/fjacjcv/programming_languages_list_wikipedia.pdf
    • https://gabanifuvumot.weebly.com/uploads/1/3/4/5/134588994/3b47c429814e0b3.pdf
    • https://jabenawonidibe.weebly.com/uploads/1/3/5/3/135385032/luvif.pdf
    • https://cdn.sqhk.co/dekaroku/Zt82Lib/64935305645.pdf
    • https://cdn.sqhk.co/wadelovelo/dlgiigb/sonic_the_hedgehog_minecraft_game.pdf
    • https://cdn.sqhk.co/baxikomo/yicRCSp/75105465547.pdf
    • http://fodosokidorakig.22web.org/kafilan.pdf
    • https://cdn.sqhk.co/pavoraxebute/biPiaXX/48880759670.pdf
    • https://jakipafowikodo.weebly.com/uploads/1/3/1/0/131070805/sogorixegetewafug.pdf
    • http://nugidaga.22web.org/85745154777.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/b82232f6-5b2c-4d72-b2ef-909521b84188/54518368422.pdf
    • https://uploads.strikinglycdn.com/files/01201512-3fdc-4864-bd08-8f3133cd4954/ribinasadikubade.pdf
    • http://vokozebutiri.rf.gd/38476970131.pdf
    • https://uploads.strikinglycdn.com/files/be4eb1e4-8ec5-4db4-b89c-39c9aee7287f/10457817848.pdf
    • https://0f285ee0-1b14-49a2-8a3e-060a2db94812.filesusr.com/ugd/4bf67f_52b17c9de68144eba02b2cc9e6b968a3.pdf?index=true
    • https://9c43cb74-45e3-47de-9527-fda2e8336169.filesusr.com/ugd/af0aa9_84a4a090ff35439381e8825de57406ab.pdf?index=true
    • http://nuvijexuwafado.rf.gd/63742419710.pdf
    • https://746420f6-3007-491b-ba72-fd43be5094e5.filesusr.com/ugd/277b62_aaa6f86cb0ce4a4f9816e6dd83208395.pdf?index=true
    • https://uploads.strikinglycdn.com/files/606cc1e5-5d01-4a1a-b2ba-ecc7019a1305/21288320845.pdf
    • http://guxozuzemonixe.epizy.com/31833650850.pdf
    • https://uploads.strikinglycdn.com/files/85a78900-faab-4e05-94a5-5a834a5d4873/workouts_in_intermediate_microeconomics_download.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010f6f.bin
fd3898e298d99df83084beb0e7974b26519dc84161576acc811ed70b03eb2f84		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10F6F 6148 bytes
font_01_sfnt_off00012453.bin
b8e4bae16d9821d5322c728f56d60cc5bfbe130a14e4669798f871946bec4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12453 11744 bytes

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