Malicious PDF — malware analysis report

Static analysis result for SHA-256 c628a846a1fa94f2…

MALICIOUS

PDF

110.6 KB Created: 2021-03-22 19:59:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: a8377eab1dab6b9eb2afa0a07be23924 SHA-1: b7ee08d309da4287b5dc4a58408c43d9f169a1c4 SHA-256: c628a846a1fa94f22e142adbfd20956a89a5df61e0899c9ca42738019a2e3f1e
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains an external URI pointing 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. The embedded content, though obfuscated, suggests an attempt to redirect the user to a malicious URL for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://ponafet.ru/strik?utm_term=the+oxford+history+of+islam+pdf+download PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4385434/normal_5fc73e74e4bcc.pdfIn PDF document text
    • https://cdn.sqhk.co/dolubivo/iBwnQij/kofapafisikaditovupuwem.pdfIn PDF document text
    • https://cdn.sqhk.co/vedasukuki/iijgidE/how_fast_do_drag_racing_cars_go.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382780/normal_602f176aa0a1f.pdfIn PDF document text
    • http://lulopoboxefon.scienceontheweb.net/13950299281.pdfIn PDF document text
    • https://cdn.sqhk.co/zugivakizo/ggjgibr/werijitimutanobopo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4378607/normal_5fc624170c7cb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469350/normal_6043e18c3ea26.pdfIn PDF document text
    • http://it50save.info/allen_carr_books_listhxhr1.pdfIn PDF document text
    • https://cdn.sqhk.co/vujenibolo/fZzUhgg/the_parenting_simulator_full_game_apk.pdfIn PDF document text
    • http://betflixguvenilirmi.com/behind_the_glass_book5hnqe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451212/normal_5fe78e43e5510.pdfIn PDF document text
    • http://power-guard.shop/nabuzigefurimugawegojip1zef.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/ea7055d0-a68e-481a-b4b4-2b8c011a708f/dave_ramsey_financial_planning.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7d7f8cde-34a9-486f-bc0f-403953f7ca98/xobatim.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dc348c30-cc1e-46e9-81c4-e4e4eebd0253/ap_english_language_and_composition_test_prep_book.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6b461ba0-7e21-4a8f-b3eb-b16457950a9f/myers_ap_psychology_textbook.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/90750453-2c70-4721-be0b-5055a6f5bd8c/sesalodazotuzobe.pdfIn PDF document text
    • http://forojiwimudobo.atwebpages.com/1952_play_by_samuel_beckett.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ad6f0857-f62a-4e9f-baec-63145f9f843a/png_text_editor_app.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bf226803-9e1f-4239-80d8-f880d40791cc/how_to_use_writing_pen_on_cricut.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/68eb6077-dafd-475e-a8b8-2c37545f1762/39633282091.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_off00017527.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17527 5492 bytes
SHA-256: a350609792d80b0fa9300e47cd9dea23604dbb399eacd6db4cda10d966d24114
font_01_sfnt_off000187c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x187C7 11068 bytes
SHA-256: ad219bbb859765c232833a99d89d04dcc8df0ad73fb973cd78807e8fed73de6b

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