Malicious PDF — malware analysis report

Static analysis result for SHA-256 a79c3637eefa98b7…

MALICIOUS

PDF

77.3 KB Created: 2021-04-06 23:51:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a53c82d1662c2bac118cb2dddef82b18 SHA-1: 092c99e20918c642390da0055a588699fe96b0b7 SHA-256: a79c3637eefa98b75c2547ab5f660e471a7980b3c92ed5397bc0019721f90946
96 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URI pointing to 'maypoin.ru', which is likely part of a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to trick the user into visiting a malicious site, aligning with spearphishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 4

  • 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://maypoin.ru/wix?keyword=pfaff+130-115+manual
    • http://ragexerate.22web.org/mojinokivanapifofimejiji.pdf
    • http://world-wild-shop.com/kisanuzoboxorefisuwkkv54.pdf
    • https://cdn-cms.f-static.net/uploads/4407780/normal_6064d38d855f9.pdf
    • https://static.s123-cdn-static.com/uploads/4416331/normal_6003cf0712e58.pdf
    • http://bigwin-1xbet.fun/silence_of_the_lambs_book_seriesp941r.pdf
    • http://dreabling.online/homemade_rifle_target_stand48ng0.pdf
    • http://kmikaerfs.ru/carbons_golden_malted_waffle_maker_instructionsifn9w.pdf
    • http://starkrobotics.org/difupojavosatulelixd0va6.pdf
    • https://cdn-cms.f-static.net/uploads/4428045/normal_6056447beb97f.pdf
    • http://arm-watch1.club/download_lucifer_season_3_mediafirefiebk.pdf
    • http://baxagaxisatipa.22web.org/54938512044.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/0b6bdcd1-b58f-4249-bdf4-fe49be901ce1/job_interview_presentation_template.pdf
    • https://s3.amazonaws.com/fomudebipefasu/westminster_abbey_self_guided_tour.pdf
    • https://uploads.strikinglycdn.com/files/a73b4420-8068-4c43-ac59-d71961df094a/57340022350.pdf
    • https://uploads.strikinglycdn.com/files/11bd3857-290f-428e-8506-2aad88809802/doro_7050tl_flip_easy-to-use_cell_phone_for_seniors_by_tracfone.pdf
    • https://s3.amazonaws.com/memobofilenabon/kutunuta.pdf
    • http://bufarudewigufeb.rf.gd/crsu_date_sheet_2018_3rd_sem.pdf
    • https://uploads.strikinglycdn.com/files/73631f0d-da9c-41d6-9e9d-4f6e2c216d5d/65521746880.pdf
    • http://koriguno.rf.gd/84659039888.pdf
    • http://ratesedefavure.epizy.com/88434515750.pdf
    • https://s3.amazonaws.com/ruzumeb/biochemistry_concepts_and_connections_1st_edition.pdf
    • https://s3.amazonaws.com/bidivo/can_you_sue_for_defamation_of_character_in_florida.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000efe0.bin
ccd0de11191a0056470cb19cafeb1bcfbfb57275c423f90eb952ef1ec68ada48		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEFE0 5152 bytes
font_01_sfnt_off00010171.bin
7547bb3294240c1a5a0815a26bda2c5fd3a945f14543179daa035e6e52b0c283		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10171 11904 bytes

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