Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7481f822f1b3289…

MALICIOUS

PDF

82.5 KB Created: 2021-05-19 06:40:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 4e6b0fc2675a39cc65c0a4b4fd8547ec SHA-1: bd3f6e1a026f454d19da419d7dd469d0a3dbaaf8 SHA-256: f7481f822f1b3289530ecb26a4059aa94bd54e9c2aae94a72a48504ec7f490dd
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm designed to redirect users to potentially malicious sites. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, and the presence of embedded URLs further supports the attack pattern of luring users to external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://pelibifir.ru/strik?utm_term=the+tragedy+of+macbeth+study+guide+act+3 PDF link annotation
    • https://wamonudikiso.weebly.com/uploads/1/3/0/7/130776885/zikaxawo-nolorofizadixut-junisiwijuj-runozawig.pdfIn PDF document text
    • https://dimavuvinidet.weebly.com/uploads/1/3/1/3/131397938/8829649.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490364/normal_603c54eb63a9e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407810/normal_5ff32167ecb18.pdfIn PDF document text
    • https://gimuloge.weebly.com/uploads/1/3/0/7/130775506/wujesomenolude.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427095/normal_603da74507cfa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pijularof.epizy.com/dirt_devil_ultra_hand_vac_with_attachments.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3148ee9c-c5f4-49cf-8fae-7b5e62b9b7ec/jelikafeto.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/38bedd63-1906-4b76-bbb4-298399bc89a0/easy_duplicate_finder_key_generator.pdfIn PDF document text
    • https://s3.amazonaws.com/fekazudabo/logitech_harmony_hub_mit_alexa_steuern.pdfIn PDF document text
    • http://bumilamufitilu.epizy.com/bapepeferuzudisefivesok.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/199206a9-944b-4cc2-8c6f-3b9671ad763f/gupetosarodebovudedomoze.pdfIn PDF document text
    • http://rojotafapexaj.rf.gd/english_consonants_phonetics.pdfIn PDF document text
    • https://s3.amazonaws.com/vikukinumet/bhojpuri_all_dance_songs.pdfIn PDF document text
    • https://s3.amazonaws.com/jadere/wevibenaritoferajovufelaw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ab6f899f-2f50-49e2-9272-5519d8cf60cc/59727617752.pdfIn PDF document text
    • https://s3.amazonaws.com/rurosaveruk/krav_maga_techniques_step_by_step.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5327f1d1-d6f0-4c7d-b558-017756be6618/blacks_law_dictionary_4th_edition.pdfIn PDF document text
    • http://pebasexun.rf.gd/atlas_copco_compressors_llc_rock_hill_sc.pdfIn PDF document text
    • http://nalevozuwe.rf.gd/blumenfeld_neuroanatomy_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5e9949ea-d4cb-4721-928b-f957114460a6/47190280931.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/23fef1b5-80cd-431a-abc7-55edcd762529/74015165633.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010458.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10458 5760 bytes
SHA-256: cfe2875e96f13f5ee5214a91ce5ae65289d9001f5ccbda7828588c012f249cf2
font_01_sfnt_off000117cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117CF 10628 bytes
SHA-256: 835e6953f5e92430aa77f695d2ecf68a3ac4d96874ce27209483f46e183ecb10