Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a4c928d8214443e…

MALICIOUS

PDF

77.2 KB Created: 2021-02-10 17:43:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 36de116b1013e0e5f18263643da65ced SHA-1: 492281c24dd31d7c638540f27cc31b86422fd3a4 SHA-256: 6a4c928d8214443ea0f0d532f2e0b9df96a7e9f128beee8a0933b4e3c2ca1d7b
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains multiple embedded links, with at least one pointing to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains text fragments that appear to be lures for phishing or malware distribution. The presence of numerous links on disposable hosting further supports a malicious intent to direct users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/aws?utm_term=cavernous+malformation+in+spinal+cord In PDF document text
    • https://cdn.sqhk.co/sofizagumup/3R92haq/brick_breaker_game_original.pdfIn PDF document text
    • https://cdn.sqhk.co/romafime/RhdEhfy/xukogijavit.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4444378/normal_5fdce97c93f39.pdfIn PDF document text
    • https://cdn.sqhk.co/fepebage/NgiieO4/zombie_hospital_game_2021.pdfIn PDF document text
    • http://guburifesujera.22web.org/therapeutic_apheresis_guidelines_2018.pdfIn PDF document text
    • https://cdn.sqhk.co/datolabevev/mTpHnhf/how_to_write_a_business_proposal_for_grants.pdfIn PDF document text
    • http://xufunuduxatene.iblogger.org/debate_motions.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455197/normal_6012ebf4ed985.pdfIn PDF document text
    • https://cdn.sqhk.co/munemuzabuk/jluFige/sonny_and_cher_the_beat_goes_on_film.pdfIn PDF document text
    • https://cdn.sqhk.co/jebavimot/cuu2YDg/world_bowling_championship_2019_wiki.pdfIn PDF document text
    • https://cdn.sqhk.co/tuwetebep/7hdjjja/76217479923.pdfIn PDF document text
    • https://cdn.sqhk.co/mofijovelu/gfjgFib/desert_survival_shooting_game_mod.pdfIn PDF document text
    • https://cdn.sqhk.co/xelajura/jancSKI/photo_collage_ideas_for_birthday_party.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
    • http://dofumuligo.rf.gd/autodesk_inventor_fusion_2012_free.pdfIn PDF document text
    • http://zaxiwuxenur.rf.gd/arbeitsvertrag_vorlage_kostenlos.pdfIn PDF document text
    • http://simipibenafar.epizy.com/somatic_hybridization_technique.pdfIn PDF document text
    • http://zexukojol.rf.gd/cdfa_annual_volume_cap_report.pdfIn PDF document text
    • http://mafevela.rf.gd/dujisosejajevob.pdfIn PDF document text
    • http://duwufinojitu.rf.gd/bluetooth_apk_for_pc_windows_10.pdfIn PDF document text
    • http://demunoj.epizy.com/waybill_forms_qld.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e1db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1DB 5264 bytes
SHA-256: 00a721693a24c9812054073a03f30b61f113360c4e6360084cfa5035be4343e3
font_01_sfnt_off0000f3ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3AE 11260 bytes
SHA-256: 121080ec9fe2c685c325f0915b78f902dd0a1beb0597f0025d7d2dcdd3a38f71
font_02_sfnt_off0001197f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1197F 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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