Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a528ec5c42fc736…

MALICIOUS

PDF

74.5 KB Created: 2021-03-22 05:59:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b49cff41952bd32bb09e98c36a74dcba SHA-1: 42175ef1c6db463a1bac4f81faabdd2347829ed5 SHA-256: 6a528ec5c42fc73693b836cb93dffb4a21f168fea375eab0cdd1e73239cfc75d
96 Risk Score

Malware Insights

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

The PDF file contains a heuristic indicating an external URI pointing to a suspicious domain, which is also listed as an IOC. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URI suggest an attempt to redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://jacksth.ru/wix?keyword=harlem+renaissance+reading+comprehension+worksheets
    • https://static.s123-cdn-static.com/uploads/4392872/normal_5ffd4375b6c87.pdf
    • https://cdn-cms.f-static.net/uploads/4409818/normal_60437b903ccfe.pdf
    • https://cdn.sqhk.co/moxoxitij/MihtjiA/1128730927.pdf
    • https://cdn.sqhk.co/tobepeliv/jdsWjfl/rpg_maker_vx_character_generator_online.pdf
    • https://cdn.sqhk.co/fudixaxogub/GjaFWdI/alienware_aurora_r9_gaming_desktop_reviews.pdf
    • https://cdn.sqhk.co/delopomixaba/aghgchj/mario_galaxy_stars_to_beat.pdf
    • http://xerijegodufiw.mypressonline.com/77983543370.pdf
    • http://nekuwagibajese.getenjoyment.net/50083449072.pdf
    • https://cdn.sqhk.co/dowufagit/VRihG9m/rivuwadu.pdf
    • https://cdn-cms.f-static.net/uploads/4378827/normal_600ec30d9eddd.pdf
    • https://cdn.sqhk.co/lawafopugu/eARicje/safutujomifoves.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/mujevubutukoxu/aircraft_maintenance_engineer_jobs_in_india.pdf
    • https://uploads.strikinglycdn.com/files/8e628b8e-253a-4a1e-8b4f-d4dcb9acb3bd/two_way_radio_antenna_mounts.pdf
    • http://gitodake.myartsonline.com/should_presidential_be_capitalized.pdf
    • http://zilowovuv.atwebpages.com/ukulele_method_book.pdf
    • http://gutekuretejapoj.onlinewebshop.net/vesoguvakivu.pdf
    • https://uploads.strikinglycdn.com/files/832ee0e1-68bc-4e2d-8dfa-e542b62caf17/rozumuzizovepakakiw.pdf
    • https://s3.amazonaws.com/risalenefazozo/what_did_mexico_give_up_in_the_treaty_of_guadalupe_hidalgo.pdf
    • https://uploads.strikinglycdn.com/files/5b057034-77fa-4aef-a9cc-d1a8a0abd737/zamidazuwo.pdf
    • https://s3.amazonaws.com/ladojenefe/how_to_find_the_best_price_on_amazon.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_off0000e422.bin
c9cdf4f222fbdaac004d1fdc922f2d065eabac9cad35343699c06c653578cf4c
pdf-font-stream PDF embedded font (sfnt) at offset 0xE422 5604 bytes
font_01_sfnt_off0000f717.bin
f250d8272a779ef379fb1ade0ec873207567609e10cdb058253bda521aeefdb4
pdf-font-stream PDF embedded font (sfnt) at offset 0xF717 11012 bytes