Malicious PDF — malware analysis report

Static analysis result for SHA-256 73e3ce0f89d6f732…

MALICIOUS

PDF

77.3 KB Created: 2021-03-05 19:01:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 0212c4e4a0cb12403d5b88f4302702e2 SHA-1: b13168239723dc69a53a6107a7ee5e81b8c860f1 SHA-256: 73e3ce0f89d6f7326e8f1acfb0b5e89a6aed0f647527a372bb04db0e4a4d130a
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs pointing to disposable domains, indicating a phishing or link-farming attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious content or download further payloads. No scripts were extracted, but the PDF structure itself is indicative of a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://kuzutuzo.ru/aws?utm_term=review+lexus+nx+300h+2015 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4469135/normal_600ece1a0e341.pdfIn PDF document text
    • http://worozoxiw.sportsontheweb.net/pronoun_practice_worksheets_for_2nd_grade.pdfIn PDF document text
    • http://lunatan.medianewsonline.com/star_trek_movies_in_order_of_storyline.pdfIn PDF document text
    • https://cdn.sqhk.co/zejizoguzut/ggpEYXM/85331735033.pdfIn PDF document text
    • https://cdn.sqhk.co/dugixikisim/hJ4XLl6/2010.pdfIn PDF document text
    • http://ig-soft-team.com/stuck_in_neutral_bookbd504.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489411/normal_60160b19d191f.pdfIn PDF document text
    • http://pesetatin.iblogger.org/what_is_the_plot_structure_of_romeo_and_juliet.pdfIn PDF document text
    • https://cdn.sqhk.co/delojiwuguj/bji9Shb/street_fighter_iv_apk_obb_mod.pdfIn PDF document text
    • https://cdn.sqhk.co/depifozopupe/ihAjagi/avatar_maker_fantasy_chibi_doll.pdfIn PDF document text
    • http://promoocaoameericanas.com/142977774114r6wa.pdfIn PDF document text
    • https://cdn.sqhk.co/jigugabopu/dijigja/texas_holdem_poker_offline_full_version_apk.pdfIn PDF document text
    • http://fasekafalig.scienceontheweb.net/tukata.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/rozebofukixus/abundant_elements_on_earth_worksheet_answers.pdfIn PDF document text
    • http://zugepoguj.onlinewebshop.net/the_misfit_of_demon_king_academy_season_2_manga.pdfIn PDF document text
    • http://nafaradevofipaf.myartsonline.com/62749272947.pdfIn PDF document text
    • https://s3.amazonaws.com/zifozujiwi/echo_pb_251_blower_price.pdfIn PDF document text
    • http://revifobatuge.rf.gd/mhw_insect_glaive_guide_arekkz.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f16a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF16A 5308 bytes
SHA-256: 90bb9c638cababeed17fa2a67c91c1551fffb140f041153b866020df3899d99a
font_01_sfnt_off0001039f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1039F 10888 bytes
SHA-256: a5210ee7964465e823b2117d546e4836cdbc79aa1dc2f2911ae063341120311b

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