Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1632cf382703d1e…

MALICIOUS

PDF

78.2 KB Created: 2021-03-28 21:44:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 9486fedd215a22faff9e06e7ffd7e018 SHA-1: c542a6f0a620672fb831fc1ca447e8dc57460a5f SHA-256: d1632cf382703d1ecb1c9bf50556512455269ef7ef027a6f13d4bc900734451e
126 Risk Score

Malware Insights

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

The PDF file is identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing/trojan. It contains numerous embedded URLs, many hosted on disposable domains, suggesting a link farm designed to redirect users. The document body, though partially corrupted, mentions "Tcs aptitude questions and answers pdf", indicating a lure to entice clicks on the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://jottigo.ru/award?keyword=tcs+aptitude+questions+and+answers+pdf PDF link annotation
    • http://pavozuketogo.mygamesonline.org/90655379291.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501037/normal_60306325b92c3.pdfIn PDF document text
    • https://cdn.sqhk.co/sunalikefazo/gjOhehd/20611424725.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413714/normal_603fdb131d473.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455375/normal_5fd5fdcceda46.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448100/normal_600cf2645f999.pdfIn PDF document text
    • http://bafedudovodamo.medianewsonline.com/cabinet_mission_plan_1946.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486036/normal_604af95a62b67.pdfIn PDF document text
    • http://mumopajikex.mygamesonline.org/concepto_alimentacion_saludable.pdfIn PDF document text
    • https://cdn.sqhk.co/fipimomozuk/Libjjgc/luke_bryan_country_songs_youtube.pdfIn PDF document text
    • https://cdn.sqhk.co/poxofufiko/Okjfgj7/heidenhain_cnc_pilot_3190_programmierung.pdfIn PDF document text
    • http://mufutekuson.getenjoyment.net/merchant_of_venice_act_4_scene_1_translation.pdfIn PDF document text
    • https://cdn.sqhk.co/mojikeke/gcqmRUH/patesojemikobisagipawire.pdfIn PDF document text
    • http://zokiwedilar.mypressonline.com/cours_de_atomistique_s1.pdfIn PDF document text
    • http://mamafiposorugul.sportsontheweb.net/aaa_auto_insurance_policy.pdfIn PDF document text
    • http://lololoj.sportsontheweb.net/70189331650.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vorisenunajix.myartsonline.com/charter_code_so200.pdfIn PDF document text
    • http://bilisedutave.myartsonline.com/58462670538.pdfIn PDF document text
    • http://tifilow.onlinewebshop.net/widanat.pdfIn PDF document text
    • http://nujugeteteda.myartsonline.com/raxulet.pdfIn PDF document text
    • http://zofutigo.epizy.com/arere_ekkada_female_song_naa_songs.pdfIn PDF document text
    • http://japefafe.epizy.com/ncert_maths_book_class_6.pdfIn PDF document text
    • http://duliwijedij.rf.gd/what_is_lattice_in_solid_state_physics.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_off0000f445.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF445 5284 bytes
SHA-256: 2149261bb9b5a178c61d7db7c0231cf008167df11927361adbef3d0e0b9b22ab
font_01_sfnt_off00010663.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10663 10868 bytes
SHA-256: 6871116446f12ee4c1664ddd7c50b5826c0b2eee923436ba8917c77f964315a4

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