Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3c1f1d8b7bb95a4…

MALICIOUS

PDF

78.9 KB Created: 2021-05-13 03:14:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: e561c22e3cb01f25421fd66c5f2671ca SHA-1: 52943db6193fef318eea761aa5018278e9860dbc SHA-256: c3c1f1d8b7bb95a4db4019cd96c9d1b538f4e8b3a8ca899b5e7f5e45640d7107
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to disposable or suspicious domains, suggesting a link farm or phishing lure. The document body, though heavily obfuscated, appears to be a decoy, with the primary malicious activity likely originating from the embedded URLs.

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://zajinet.ru/strik?utm_term=organizing+the+periodic+table+worksheet+answer+key PDF link annotation
    • http://dumigegin.medianewsonline.com/97741290002.pdfIn PDF document text
    • http://1xbet-football.fun/knights_of_the_old_republic_xbox_one_controls3z3em.pdfIn PDF document text
    • http://profer-opt.ru/math_kangaroo_practice_testse3ih9.pdfIn PDF document text
    • http://nigoguno.scienceontheweb.net/99559559584.pdfIn PDF document text
    • http://poruzotosiku.getenjoyment.net/68816400818.pdfIn PDF document text
    • http://kafofal.mygamesonline.org/kegofuzufek.pdfIn PDF document text
    • http://wikowezenitezo.medianewsonline.com/cm_van_den_heever_laat_vrugte.pdfIn PDF document text
    • http://rivalo130.com/remington_700_adl_vs_bdl_vs_cdlf9euu.pdfIn PDF document text
    • http://kzrovk.xyz/saxosolovosepis8f0hw.pdfIn PDF document text
    • http://gosugas.getenjoyment.net/perfect_square_roots_list.pdfIn PDF document text
    • http://gallery-shop.site/58067029243e2sqx.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://nevabaza.atwebpages.com/distinction_between_assessment_evaluation_and_measurement.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6b028db5-2287-42ee-a4ea-58e57fec47ca/how_to_fix_diaper_genie_complete_lid.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5660a4bb-c994-4bc0-ad59-bc2945367946/bonejapoliviwurajuk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a86f01f8-1a40-4aed-af27-2631b1a6ce39/how_to_tell_if_a_gold_buffalo_coin_is_real.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ed8ddfa5-cd3e-442d-9909-fff289f186ec/85688912762.pdfIn PDF document text
    • http://zutugidod.onlinewebshop.net/guxovewominarubipunif.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d3521d6b-6634-433b-8772-b6eb24690800/wudemefor.pdfIn PDF document text
    • http://laxuzoto.onlinewebshop.net/92969697546.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e4e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4E2 5600 bytes
SHA-256: 3eb70b28ceeb37abd38ac89be135e15f46594e2e3c3032e604e321b9e9d8ed08
font_01_sfnt_off0000f7f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7F5 11164 bytes
SHA-256: f59dc9839491a93ed844af68656abbd0fd0dd84fc06568942ce8cf194d717646
font_02_sfnt_off00011e0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E0D 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

Open this report in the interactive analyzer, or submit your own file for analysis.