Malicious PDF — malware analysis report

Static analysis result for SHA-256 3694680bef7ba799…

MALICIOUS

PDF

82.6 KB Created: 2021-04-02 16:52:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: b5693105ed701f11b8672afa2bfc0fc9 SHA-1: ec0529ed7b0ac557eeb87661dd9e8e995632b7ff SHA-256: 3694680bef7ba799a213712d6d0e86e75fb00c8af0b647a05152363e368be85d
186 Risk Score

Malware Insights

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

This PDF file contains a large number of external links, many pointing to disposable domains, suggesting a link farm or SEO spam operation. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. The document body, though heavily obfuscated, appears to be a lure related to a common search query, aiming to trick users into clicking the embedded malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://ponafet.ru/strik?utm_term=what+does+it+mean+when+your+washer+says+f21 PDF link annotation
    • http://job-finder.space/12477355976jk4ys.pdfIn PDF document text
    • https://lexugorubu.weebly.com/uploads/1/3/0/7/130776619/4f34e2.pdfIn PDF document text
    • https://kepijiloxa.weebly.com/uploads/1/3/4/1/134108658/marafowusuxibe-gogabizimuvil.pdfIn PDF document text
    • https://vakogiguwowokel.weebly.com/uploads/1/3/0/7/130775334/peliz.pdfIn PDF document text
    • http://stakingyfi.com/tosunigejacc9b.pdfIn PDF document text
    • https://vesumuzuvof.weebly.com/uploads/1/3/4/6/134685641/xovamapejuveda.pdfIn PDF document text
    • http://bottlechainworld.com/grammar_exercises_grade_7px7ba.pdfIn PDF document text
    • http://shopeuro.pro/93631647065xwtfd.pdfIn PDF document text
    • https://sizamefoz.weebly.com/uploads/1/3/2/7/132740636/7823114.pdfIn PDF document text
    • https://sukodijam.weebly.com/uploads/1/3/4/5/134516983/7327686.pdfIn PDF document text
    • http://zugosaxoma.iblogger.org/bm_english_speaking_book.pdfIn PDF document text
    • https://zugavalomiseba.weebly.com/uploads/1/3/6/0/136082075/787534.pdfIn PDF document text
    • http://zezomaxijuduj.22web.org/frigidaire_refrigerator_repair_parts.pdfIn PDF document text
    • http://nosinoski.shop/sofewumezagadelipijugs08g.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://75a697d3-84f0-44cf-bab9-f05e37020c50.filesusr.com/ugd/7c3584_996d7c669db5453a809225d1603a4d22.pdf?index=trueIn PDF document text
    • https://e2604e0b-f95a-4acb-b53f-a7db3827b2a1.filesusr.com/ugd/225520_ff6000bb6bce4cf0b592d06dab3aa8b7.pdf?index=trueIn PDF document text
    • http://todazanimidut.epizy.com/konusosojidago.pdfIn PDF document text
    • http://deroselewem.epizy.com/paxidujotetasumeruwanuref.pdfIn PDF document text
    • http://vizepojuduw.rf.gd/aircraft_landing_gear_system.pdfIn PDF document text
    • https://0ea1ff7f-05b3-43a2-9744-178351a05ed1.filesusr.com/ugd/01f9b9_3d5eb1df4303400094422754fc20b0c7.pdf?index=trueIn PDF document text
    • https://6c403777-3bdb-430d-a4ca-23d5788374d5.filesusr.com/ugd/e0034b_f52ff397a7c6479ca106e37b0e2fa5b1.pdf?index=trueIn PDF document text
    • https://ec75ba9f-29a7-4b73-bb51-4c951d20089f.filesusr.com/ugd/17cde0_fed3d80fb2934d49b335f0b25e5137fa.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010329.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10329 5504 bytes
SHA-256: 287a5ca147b45df71fabdf0e969847ff4d23ab3ffb1a90802f6a902a403812ee
font_01_sfnt_off000115dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115DC 11072 bytes
SHA-256: fbba6ce1c1c418897339711bd4675a6bf7fe57d4a0593a20bab5bac57fe62ccf