Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a79f3374b1a9c8c…

MALICIOUS

PDF

70.7 KB Created: 2021-04-07 05:03:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 989db6dfd91d839912d206c993002383 SHA-1: 25312d27089d65a67390e74600700793a763b5bd SHA-256: 5a79f3374b1a9c8ce257872cdba5f07ecbe4581360c5d1a303e3544637c12cd5
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 hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the presence of numerous external URLs points to an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://baarspo.ru/award?keyword=angielski+gramatyka+pdf+chomikuj PDF link annotation
    • https://tixonanixob.weebly.com/uploads/1/3/4/8/134890866/504901.pdfIn PDF document text
    • https://cdn.sqhk.co/kisasizaro/aihFhc4/cats_clash_epic_battle_arena_strategy_games.pdfIn PDF document text
    • https://xufodikufidu.weebly.com/uploads/1/3/5/3/135382923/wisavodetet-lunufovedita-totofuziju-tajizizoduwuja.pdfIn PDF document text
    • https://cdn.sqhk.co/sikibeve/dQjjhaj/flutter_push_notification_android.pdfIn PDF document text
    • https://cdn.sqhk.co/pijujuweg/dTjbQie/hidden_agenda_meaning_and_examples.pdfIn PDF document text
    • https://vakozumemarob.weebly.com/uploads/1/3/1/0/131070483/xuxekazi.pdfIn PDF document text
    • https://jabuzowe.weebly.com/uploads/1/3/4/3/134312688/893078d482f3.pdfIn PDF document text
    • https://zobanegasub.weebly.com/uploads/1/3/1/1/131164549/0d220b1c4027.pdfIn PDF document text
    • https://raputaluwim.weebly.com/uploads/1/3/1/6/131606275/xarevilufijedarapipi.pdfIn PDF document text
    • https://gulufoge.weebly.com/uploads/1/3/0/7/130776817/sojitaguju.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://891dfe3a-8969-4df2-b253-5ccc4ebbb7a0.filesusr.com/ugd/e66789_c0905398b3304f9ab015f66112358728.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d80c4942-329a-4d93-bb01-bf0baa1f6d5c/11483966143.pdfIn PDF document text
    • https://3f054cde-0430-4828-89d0-5f77035cf230.filesusr.com/ugd/d93890_fbe20c18dde340b6b00d543d92570904.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/741617e1-d0e3-428f-9cbd-c7409aba8ba6/11436610910.pdfIn PDF document text
    • https://033a7475-7ccb-45c1-8f1e-38fd320d48d0.filesusr.com/ugd/03a576_f960a8e488e24aa79e42003e6f2449db.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/4f262525-d664-479c-b8fc-4fa590f698f4/83098755849.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e3fda62a-4b0f-4c50-95fd-8f1ddc5e6c41/jack_reacher_never_go_back_full_movie_in_telugu.pdfIn PDF document text
    • https://3dd85f33-233b-4b3c-8e53-142bc8307eec.filesusr.com/ugd/8df890_bbb27764b5b54b00804b8e2064d2cc12.pdf?index=trueIn PDF document text
    • https://5849b288-062f-49f8-a71b-da420f1f00fd.filesusr.com/ugd/c068f8_103b7c4d27924cbe91a15481a189f161.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/56a96901-bfed-4bcf-a2df-692b7419dbff/what_were_the_stages_of_the_french_revolution.pdfIn PDF document text
    • https://2a082fd4-e93f-4b8e-9e59-408fa046b31c.filesusr.com/ugd/e334dd_7a87e8d0e18c49bd8c396d6f399a6641.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_off0000d6e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6E2 5800 bytes
SHA-256: b8f59f5a12f73a16822ab35f1eb0b0e116d83f22a6e25c1e1eb776a315c4d7e4
font_01_sfnt_off0000ea92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA92 10900 bytes
SHA-256: c81e528ec71a458b077c5030752ae252d9e4a2728c12150d152df4d7fb0a74cd