Malicious PDF — malware analysis report

Static analysis result for SHA-256 24d781d7e4372891…

MALICIOUS

PDF

83.0 KB Created: 2021-04-15 10:20:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: e6828a7a312e5ec6202c9de4fe81a1b1 SHA-1: 5bb75fd3e82acc710d816b22a2fbc6d4a3bf7223 SHA-256: 24d781d7e437289177781a27c0ed97cdb6a0fb25500a31f51b64cf3291acb825
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://dafemum.ru/strik?utm_term=blackburn+trakstand+user+manual PDF link annotation
    • https://cdn.sqhk.co/mofijovelu/4xn1Ahe/nova_launcher_prime_apk_revdl.pdfIn PDF document text
    • https://cdn.sqhk.co/woberimi/jhibihm/extra_life_charity_logo.pdfIn PDF document text
    • https://cdn.sqhk.co/zizenozi/jwfIFQh/hockey_meaning_and_synonyms_of_conviction.pdfIn PDF document text
    • http://mivimivisodawo.iblogger.org/project_report_on_online_food_ordering_system.pdfIn PDF document text
    • http://mobutadaxez.medianewsonline.com/acceptance_and_commitment_therapy_training.pdfIn PDF document text
    • https://cdn.sqhk.co/ledodatefu/iidm5lo/69700885522.pdfIn PDF document text
    • http://kifopelidito.mypressonline.com/8949789700.pdfIn PDF document text
    • http://juwaniwabi.medianewsonline.com/nutricion_parenteral_en_pediatria_2020.pdfIn PDF document text
    • http://rimaloxal.22web.org/selid.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://4fdc5cb1-0646-4ed0-9ac1-f9332ff2c333.filesusr.com/ugd/9b9480_42713db3759748469315cbf74667716b.pdf?index=trueIn PDF document text
    • https://84d5b3ab-51dd-4312-87b7-51df18fb3b26.filesusr.com/ugd/9ea9b6_f5c56ead344e49eda1c66edc90731538.pdf?index=trueIn PDF document text
    • https://959e49da-b405-4961-97d4-5c1bb2e9a628.filesusr.com/ugd/ab0441_0cfdddb015a04145a9de48e3c9571dec.pdf?index=trueIn PDF document text
    • http://leruvuk.epizy.com/starcraft_hybrid_travel_trailers_for_sale.pdfIn PDF document text
    • https://26577e91-18e8-42c3-8e85-49dcca1d6605.filesusr.com/ugd/195787_3ae58f8d6d5440aa83a6a7a4ac5f82e6.pdf?index=trueIn PDF document text
    • https://8ed7b8cb-9bae-4def-ad9b-66b28cd11f91.filesusr.com/ugd/740d8c_6dcf441f7aac47c9919c94ce47765cbc.pdf?index=trueIn PDF document text
    • http://xepujeroniwazip.epizy.com/97510124568.pdfIn PDF document text
    • http://mipaziti.rf.gd/titejalewosaxa.pdfIn PDF document text
    • https://dc58184e-bbba-402a-8e08-a55d552c8f3f.filesusr.com/ugd/0ebc1f_5c4a68310f9845d18474c55c2853984c.pdf?index=trueIn PDF document text
    • http://kitalanexu.epizy.com/a._d._g._c_criminal_full_form.pdfIn PDF document text
    • http://jalijoruki.atwebpages.com/cache_memory_types.pdfIn PDF document text
    • https://beea745c-e446-4317-9ad8-fe501d584c0a.filesusr.com/ugd/9196db_65a559206dbe40829eacabcb8d099d08.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_off0000f971.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF971 5064 bytes
SHA-256: a0b2969e3c66c0ad9662c87b954d1409e55bc9c0a26d2628e9494ed1afc3b08b
font_01_sfnt_off00010a88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A88 11032 bytes
SHA-256: 0216f62f56e512c3497201f080823ba2475e688c83b26ea957afbab7a8cdf311
font_02_sfnt_off0001302d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1302D 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176