Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fcf5282ad2e6273…

MALICIOUS

PDF

97.5 KB Created: 2021-03-13 14:05:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: be8240d5683de474fc2a2abdecf0de8f SHA-1: b6a7b4e55b3b2da8f6c6be9d823a93df5a7829e6 SHA-256: 8fcf5282ad2e6273786591077b53154b95cd36457651a2ea91008fe353c238b3
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, many hosted on disposable domains, suggesting a link farm or SEO spam operation. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were directly extracted, the PDF structure and embedded URLs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://maypoin.ru/wb?keyword=pioneer%20fh-x700bt%20review PDF link annotation
    • http://werikipirojenob.scienceontheweb.net/57869620208.pdfIn PDF document text
    • https://cdn.sqhk.co/ledodatefu/TzsUfhj/rexuremupozojewisesadakin.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369919/normal_6031f42e8b7fa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383444/normal_60462a86398b0.pdfIn PDF document text
    • https://cdn.sqhk.co/mibuguxinise/jgidhcQ/arcade_shooter_games_online.pdfIn PDF document text
    • https://cdn.sqhk.co/kelopifagisu/iSgQ8jh/classroom_of_the_elite_japanese_name.pdfIn PDF document text
    • http://sipipewawezizuf.getenjoyment.net/57600468259.pdfIn PDF document text
    • https://xoresobo.weebly.com/uploads/1/3/1/4/131407398/5843043.pdfIn PDF document text
    • https://zirorimasarikar.weebly.com/uploads/1/3/4/1/134108573/kofunawakovijalu.pdfIn PDF document text
    • https://cdn.sqhk.co/kezixowog/S98omha/unhappy_wallpaper_for_android_cute.pdfIn PDF document text
    • https://cdn.sqhk.co/murerezusa/egf3gcw/ark_survival_evolved_xbox_one_cheats_wyvern.pdfIn PDF document text
    • https://litiwufedoza.weebly.com/uploads/1/3/0/7/130739575/sipimo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471484/normal_6041b7a60abdb.pdfIn PDF document text
    • https://xijukuto.weebly.com/uploads/1/3/4/3/134354051/vufevo_gejabe.pdfIn PDF document text
    • https://cdn.sqhk.co/suvonigez/hihe3jj/62278398533.pdfIn PDF document text
    • https://cdn.sqhk.co/dekaroku/RNSz5pX/walmart_neighborhood_market_phone_number_near_me.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495402/normal_5ff42ca6d199e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413968/normal_5fe28cbc3a046.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://89f68ddc-9f98-4e60-8afa-3e0ca6603e9e.filesusr.com/ugd/4725f1_8c5071d984a94e8794072f2cb4c46e98.pdf?index=trueIn PDF document text
    • https://0e098354-e5d1-4afc-9be7-763a70ae5e44.filesusr.com/ugd/ef253e_8290bedf2ded40bdb7f1778d885d520f.pdf?index=trueIn PDF document text
    • https://ca6b24e6-01cd-4368-a310-1df05077a315.filesusr.com/ugd/11b39a_867dd0ed01b14105805769c5605ba20e.pdf?index=trueIn PDF document text
    • https://6674166f-eb58-46b1-9d38-a528bc95e02c.filesusr.com/ugd/e38d8e_0f2b1721e397426b91596cf019ee2bd3.pdf?index=trueIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000132a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132A3 4840 bytes
SHA-256: e21a422bef669efd76f8f73360c1bfd8f17e967849a9f2357a127cb64d7b64b6
font_01_sfnt_off00014320.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14320 11204 bytes
SHA-256: 18e9a0ca2fc3c3b08961122b8d93b0f90c450fcffc12802f381b2e8eb9fccdbd
font_02_sfnt_off0001693f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1693F 4324 bytes
SHA-256: 781b9fae2fb9201b4a05d2041fea553bb2973f1d011ab9c51e3326c72e342c60