Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7637ac507dff756…

MALICIOUS

PDF

79.6 KB Created: 2021-03-10 00:29:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: c5414eac0191d6cf55aaff484abc6ec4 SHA-1: 5a8c8fed9c596824b07d3a01b5bd01891a979e37 SHA-256: f7637ac507dff756f381325e55fd4185d0098452d29e012588bab9f2bbae9f61
186 Risk Score

Malware Insights

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

This PDF document was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The primary malicious behavior appears to be the inclusion of a large number of external links, forming a link farm, likely intended to redirect users to phishing sites or download further malicious content. While no scripts were explicitly extracted, the PDF structure and link farm suggest an attempt to lure users to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://golowaki.ru/award?keyword=autoimagem+psicologia+pdf PDF link annotation
    • https://cdn.sqhk.co/beledufe/VibvQpH/keyboard_for_seniors_app.pdfIn PDF document text
    • https://cdn.sqhk.co/wafepazi/j7hj3T9/96581980832.pdfIn PDF document text
    • https://cdn.sqhk.co/ranetixeba/f4ZbQVY/40628111640.pdfIn PDF document text
    • https://tariwina.weebly.com/uploads/1/3/0/7/130739483/7185146.pdfIn PDF document text
    • https://cdn.sqhk.co/nedivixozu/jcEjdhf/ringcentral_meetings_outlook_add_in.pdfIn PDF document text
    • https://dedaruxije.weebly.com/uploads/1/3/4/4/134455514/favegakan.pdfIn PDF document text
    • https://cdn.sqhk.co/bepotedaxus/gchblhe/bunus.pdfIn PDF document text
    • https://cdn.sqhk.co/tumosirewuw/jgjbP4a/pet_pals_game_ios.pdfIn PDF document text
    • https://cdn.sqhk.co/bupabumo/jhagrVz/bodokimajoru.pdfIn PDF document text
    • https://cdn.sqhk.co/tipefimex/hi6hg9V/police_car_siren_soundboard.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
    • https://43a2ba88-5de9-465b-b95f-6a4d82f2d06e.filesusr.com/ugd/dcbeda_c4a1ca476a4b4f228bc3f8786fd95fa1.pdf?index=trueIn PDF document text
    • https://493f174a-a540-412c-bacb-e5b7b26cbfcf.filesusr.com/ugd/95bb70_97523b3527d943379a1371ecb2943bcd.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ed3482ce-c4df-40d7-b63f-30996c4cfcc2/when_will_walmart_release_black_friday_ad_2020.pdfIn PDF document text
    • https://7893bdd6-41e4-48f6-9953-3a636dfb5d61.filesusr.com/ugd/c5c63b_e19d56b5aa26484dba9cdd73af51afd1.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/0e673779-5531-4e9e-8ec5-6a2ac609bc08/what_is_the_best_epson_printer_for_sublimation.pdfIn PDF document text
    • https://ec5c17a1-061e-4a2c-a9e6-b3561ba71229.filesusr.com/ugd/299074_19972d49b0bc4ee1a4a4e0ddead4c871.pdf?index=trueIn PDF document text
    • https://b32521b7-32ca-447e-9967-d27d0dce683d.filesusr.com/ugd/800b88_2fc9bf0d7b3b48ff91e5a80217449067.pdf?index=trueIn PDF document text
    • https://58552d80-c20c-4e4f-99b9-91bedbcc07a3.filesusr.com/ugd/c18496_1bfd9f8d773844efb073d8bdd5789463.pdf?index=trueIn PDF document text
    • https://e8f98835-b194-42a5-b43f-fe2f29920dd6.filesusr.com/ugd/bf650e_4e3a78a2e0e5432d84a782f1781d15c2.pdf?index=trueIn PDF document text
    • https://ed36ca5d-e6e9-4caf-8bbb-3a8af5cfee16.filesusr.com/ugd/971556_14459eb5ca0d4f36952995de0ffe564b.pdf?index=trueIn PDF document text
    • https://39472683-7d43-4bc3-882b-0947a83fd973.filesusr.com/ugd/544c7e_e1606f7a9e1848a889aa72c3093b6e04.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000edf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDF5 5144 bytes
SHA-256: 609781bac43db3583ceebbe59c6a40b2c78901a7303fe94c2272ed6e92af799b
font_01_sfnt_off0000ff7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF7F 10228 bytes
SHA-256: d597520233e7f990d9e10842164898cce18ce103c782381fe0ab144a6725e486
font_02_sfnt_off00012283.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12283 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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