Malicious PDF — malware analysis report

Static analysis result for SHA-256 f70ac7f9bf5d037e…

MALICIOUS

PDF

70.3 KB Created: 2021-04-08 23:42:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 4cc6177d4e43a3cc7d35a989fa6b724f SHA-1: f2ea9bfd2f33aa3c9c6f76378e68f1afe54e9caa SHA-256: f70ac7f9bf5d037ec6b18a72178fbf4cc06f82da35ed779cdee7895481d18aa2
126 Risk Score

Malware Insights

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

The PDF contains an embedded URL that redirects to a suspicious domain, identified by heuristics as a link farm on disposable hosting. ClamAV detection and ML classification strongly indicate malicious intent, specifically phishing or malware delivery. The document body, though partially corrupted, suggests a lure related to 'Evolution and natural selection review packet answers'.

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
  • 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/strik?utm_term=evolution+and+natural+selection+review+packet+answers PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4393369/normal_6042e9fcbcac7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415304/normal_600b70a02ad64.pdfIn PDF document text
    • https://cdn.sqhk.co/vavewiminiv/Hhbcaa0/bohemian_rhapsody_virtual_piano_sheet_easy.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469841/normal_5fda52bc819e1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486969/normal_5fceb11e1bf9b.pdfIn PDF document text
    • https://cdn.sqhk.co/punipopi/ohjhagi/rimogatib.pdfIn PDF document text
    • http://jofigapowewumaw.22web.org/dead_wake_movie_rights.pdfIn PDF document text
    • https://cdn.sqhk.co/depadukat/gfHgehf/the_last_maverick_survival_pro_mod_apk.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://ff9dba89-6132-4485-99c2-ace8a2453124.filesusr.com/ugd/c3f59f_04b737058f6a4163b74ecef48fc05167.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d1ba7a42-989d-4a43-9fcf-00c45af5970f/43180978048.pdfIn PDF document text
    • https://f05e0dbb-21cf-40ea-8b71-00b8d6f49a3b.filesusr.com/ugd/b09e1d_b301ab72636e418f98f5963101e8dbcf.pdf?index=trueIn PDF document text
    • http://goruwon.epizy.com/bujonovojarubi.pdfIn PDF document text
    • http://nepejalaziba.rf.gd/erico_cadweld.pdfIn PDF document text
    • http://fujebudavitasoz.epizy.com/80918273956.pdfIn PDF document text
    • http://daraxelasapok.rf.gd/guidecraft_jr._rainbow_block_20_piece_set.pdfIn PDF document text
    • http://rerexewiruved.epizy.com/alice_in_wonderland_full_text.pdfIn PDF document text
    • http://nuzubiwow.epizy.com/nozasijekupanizipupopa.pdfIn PDF document text
    • https://f8340159-69ce-4309-ac43-521e9a8475b4.filesusr.com/ugd/bc0b97_166e74a95a2f4ff29981410205c0f266.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ed5d933f-c382-4a93-b02d-a8f6a1ac31a8/dinitaxikabojaxo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2038976f-5868-40cf-9682-b474d9173d8d/bullet_rush_game_mod_apk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1b53204b-13f6-4735-ab95-35c1159f3a05/70961487558.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_off0000d554.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD554 5240 bytes
SHA-256: 3d5be3e21b6ad878915add1d63dd2962102d2412e186c11b68099dc87ef428ba
font_01_sfnt_off0000e74f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE74F 10700 bytes
SHA-256: 7ec8cddc7d55fabd237baadb7326a5b22666a420eb98971142406bee0029c262

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