Malicious PDF — malware analysis report

Static analysis result for SHA-256 f078413476ff67e3…

MALICIOUS

PDF

88.0 KB Created: 2021-03-15 12:26:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4adb0336241e23d7b858949e68a57c32 SHA-1: 96b53f46007ea1db3b23a148871394e443ec1bfd SHA-256: f078413476ff67e3e49f9b1727d9cc819dad8373cf98b2d404433561f1b8dc46
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious. It contains a large number of external links, many of which point to potentially malicious domains, and one specific URL was identified as a primary lure. The document body, though partially corrupted, suggests a deceptive pretext related to English verbs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://jumiwimov.ru/strik?utm_term=lista+de+los+verbos+irregulares+en+ingl%25C3%25A9s+infinitivo+pasado+simple+participio
    • https://cdn-cms.f-static.net/uploads/4421627/normal_601c787d17c95.pdf
    • http://kedepoba.sportsontheweb.net/rudram_namakam_telugu_free_download.pdf
    • https://cdn-cms.f-static.net/uploads/4380219/normal_601a6c89b1b07.pdf
    • http://mutujejeturuduf.medianewsonline.com/how_to_cancel_enercare_hot_water_tank_rental.pdf
    • http://zakukamupavi.22web.org/75133313960.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/9be7438f-6db6-4aef-9a9e-0d62aefe0a96/nipoleta.pdf
    • https://78e27e65-9996-4239-a63d-7a21722db537.filesusr.com/ugd/03f576_98b11d723dd04bc080ca196efe9f5097.pdf?index=true
    • http://faxevimisosideg.myartsonline.com/beats_solo3_wireless_on-ear_headphones_noise_cancelling.pdf
    • https://uploads.strikinglycdn.com/files/db70c38b-c982-46f7-9c4b-b36eba34e0fe/which_is_the_best_institute_for_data_science_in_india.pdf
    • https://uploads.strikinglycdn.com/files/2ff1e1c8-397e-4c9d-a8fb-f0375724dde6/lizuvimej.pdf
    • https://uploads.strikinglycdn.com/files/05f0e10f-ecd6-4fe9-89aa-2cb04a60c05b/linear_algebra_4th_edition_slader.pdf
    • https://da550aaf-34ae-4f9b-ad82-7836b82beebe.filesusr.com/ugd/a203e6_3b3cc22105ae42949f413edf674977dd.pdf?index=true
    • https://uploads.strikinglycdn.com/files/9a2e051f-eb11-46cf-9f96-47d8fd2cb3cf/samsung_dishwasher_dmt800rhs_error_code_oe.pdf
    • https://uploads.strikinglycdn.com/files/fe8eca00-a0af-4b23-afdf-2660a755e701/simple_compound_and_complex_sentences_worksheet_6th_grade_with_answers.pdf
    • http://dipumekamerara.rf.gd/all_chemistry_formulas_class_10.pdf
    • https://77bc4ea4-de20-41c0-a463-a5315db628d9.filesusr.com/ugd/2c69e3_31114e26775144f6b0dd799e9a01827a.pdf?index=true
    • https://uploads.strikinglycdn.com/files/75910159-b804-4cea-9c8e-335be883cf7d/circe_madeline_miller_nyt_review.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001023e.bin
ce7b79905bd1d64f13912ca34afdea1c99bf929c1f8a28dabc2358f95b9aabfa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1023E 5756 bytes
font_01_sfnt_off0001158a.bin
0c52f1bb3fc5438961764c2e69464260e8eece39cb7943fd009672a850ec1510		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1158A 10300 bytes
font_02_sfnt_off000138cc.bin
31aa257675234f953cb39254c73a0c002637764ec2691c470e0912636c3685cf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x138CC 16204 bytes

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