Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a6b6993cf8b0b89…

MALICIOUS

PDF

90.8 KB Created: 2021-03-12 09:45:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 33accc8aa41e55455e4b44d96deba3a1 SHA-1: 22bebc24cb6deff924f2488bb2da7fbb8ffb15f7 SHA-256: 0a6b6993cf8b0b89da3b2c13ee10a6e1a6781fd065109e36c01d3574c74aa4dc
126 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, with heuristics indicating it's a link farm on disposable hosting. The embedded URL points to a suspicious domain, suggesting a phishing or malware distribution attempt. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious intent, likely related to spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://midufefew.ru/123?utm_term=arabic+language+learning+software+free PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4410194/normal_5fc6642e5d2c2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484364/normal_601373e0da973.pdfIn PDF document text
    • http://bigops.fun/how_to_do_proper_istikharahye24.pdfIn PDF document text
    • http://redirunna.xyz/puzogobigu2xrd6.pdfIn PDF document text
    • http://cmb-accueil.com/ocarina_of_time_gba_rommftze.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403415/normal_5fca862b7d488.pdfIn PDF document text
    • http://makamar.tech/housekeeping_manager_job_descriptionojjtr.pdfIn PDF document text
    • http://lorenbayi.com/hamilton_beach_durathon_iron_wont_turn_onnndmg.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480886/normal_5fda312600ac5.pdfIn PDF document text
    • http://salet.store/40567941267g7d3i.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365560/normal_6015b755b3c39.pdfIn PDF document text
    • http://tdsevsvet.ru/61298410740ryvpj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476133/normal_600eec0258ae9.pdfIn PDF document text
    • http://mebelintera.ru/38272585844rif9z.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495040/normal_5fcfb07b98799.pdfIn PDF document text
    • http://perevod24-card2card.site/tumblr_for_pc_windows_10l4avp.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423136/normal_6030d949c0d9b.pdfIn PDF document text
    • http://fredo.bike/elements_of_civil_engineering_notesno92c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://aa514bbb-a96e-4bc9-8ff3-0ca2edd1104f.filesusr.com/ugd/3fc21f_3278b59130f34183b9f1daf3db1a23c5.pdf?index=trueIn PDF document text
    • https://dc273c12-e125-4738-b2e6-b96bc4bd5eb7.filesusr.com/ugd/c8df25_06dadfaf8f4b4c21b0075227d9ce1c55.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/4afd9502-3fe3-4958-be91-d29d7ed8279e/what_is_the_sum_of_exterior_angles_of_a_15_sided_polygon.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7ad7cbc0-1dd5-4488-bf7e-a5ee8e86d502/thrustmaster_t_flight_hotas_one_joystick_for_xbox_one_and_pc_review.pdfIn PDF document text
    • https://80172413-d145-4b71-b7cf-4a007d76ad29.filesusr.com/ugd/cacfd7_717c2b204c2549ecb2e68709b0e2e7de.pdf?index=trueIn PDF document text
    • https://ac685e6e-6442-44c0-91a1-b3a367e79ef2.filesusr.com/ugd/ce77c6_24ef7d7bf7ec4ef394d910d5e262b8b4.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/5d3bfe90-4c68-4aa4-92f2-22c69dbefe43/how_do_you_apply_nail_stickers.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001054d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1054D 5268 bytes
SHA-256: 5977d8d0926f08f31ceda25e3a556848504aa298379f2dacd00610e24292c93c
font_01_sfnt_off00011759.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11759 11364 bytes
SHA-256: 007cf583781ba024e37452fb5766343175d848640ebef2bef01fc0d53d4fec1d
font_02_sfnt_off00013e4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E4A 19016 bytes
SHA-256: 0ba112b649f716313753cefb89109f5f35a8b6b7dd1d6a7e87fd1d324aa932c1