Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6162247cf0bd6c3…

MALICIOUS

PDF

140.3 KB Created: 2021-03-22 15:41:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 8a12d6c30c1e452a3407af194422e566 SHA-1: 7bc74a4953947170b109a814288d9e726aa5852a SHA-256: f6162247cf0bd6c3e284a7520b30789f8af08d5ac43d08b9fb240c62614ec772
126 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it functions as a link farm on disposable hosting. The embedded URLs and the document body, though partially corrupted, suggest an attempt to direct users to external, potentially malicious sites. No scripts were extracted, but the presence of numerous external links points towards a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

Heuristics 5

  • 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 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://kuzutuzo.ru/award?keyword=real+audiencia+nueva+espa%25C3%25B1a+pdf PDF link annotation
    • http://raftgjgr.space/147064221205baqs.pdfIn PDF document text
    • http://osthondroz.com/pool_closing_instructions_in_groundk079o.pdfIn PDF document text
    • http://pushbiz.fun/66752799582lxj1s.pdfIn PDF document text
    • http://sy0n.icu/how_to_check_sentence_structure_in_microsoft_wordeqxsc.pdfIn PDF document text
    • http://theharaka.online/what_are_the_parts_of_a_roof_called_ukz45w6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479446/normal_6044d5c1897ff.pdfIn PDF document text
    • http://brosbass.com/bovajuxipotupomuxedpt56x.pdfIn PDF document text
    • http://voicebftyi.com/how_to_derive_the_cost_function0dki9.pdfIn PDF document text
    • http://blockhcain.host/glacier_bay_pull_out_kitchen_faucet_repairvbwlf.pdfIn PDF document text
    • http://storeeu.info/1794-oe8_wiring_diagram69irc.pdfIn PDF document text
    • http://subbellassecret.com/cake_decorating_tips_for_flowers32h8p.pdfIn PDF document text
    • http://f1l3download.site/zororadivacrw3j.pdfIn PDF document text
    • http://aydym.club/diferencias_entre_medios_de_comunicacion_antiguos_y_modernosqwbgq.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451940/normal_605677737315c.pdfIn PDF document text
    • http://mazers.fun/amoeba_sisters_microscopes_answer_keyc3sk2.pdfIn PDF document text
    • http://changely.club/6421847646425j3r.pdfIn PDF document text
    • http://formulamoney.top/bilakonimipuxexzmcfl.pdfIn PDF document text
    • http://lalat.space/guitar_chord_theory_for_beginners0mqkx.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/aaa1bd71-f251-435a-bab1-3186b6e5ea5e/xivuxaruseg.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a8059719-b877-4237-bf51-4ff481d3b2e7/dell_poweredge_r710_price.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d6c76e5b-d062-4687-ba4b-205dd137af91/the_art_of_the_start_book_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/369ca36b-f110-41f1-89e7-53f328b09889/sezilikufawix.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/569d9d48-c027-4ed4-a4a1-529003a84991/61749858818.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001d60b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D60B 5332 bytes
SHA-256: cdd7d935823ae6a37e5b554b2656f3ffcd5f44ec2f9344c1ef3bd24dc3e58a0d
font_01_sfnt_off0001e812.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E812 10704 bytes
SHA-256: 9af3cf295c5b530e906f5e70f46fd16861a6d48da82831578609195eef854a53
font_02_sfnt_off00020bf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20BF5 16204 bytes
SHA-256: a95eff378c135b1ab40d10b3cd1da1bafbc07f86005f57898d079c90d712ddbd