Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c6388bc65a11ca9…

MALICIOUS

PDF

75.4 KB Created: 2021-03-20 08:48:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 380c759d2d83b00028f105a972b993ed SHA-1: cd593d8b61df9b0726f1ed474bfe1e3a43d56a4c SHA-256: 8c6388bc65a11ca9dde9b3b22e04bf8f38146ecda1c9179280b4b9bd2eff5705
244 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of embedded links, many pointing to disposable hosting, and at least one link to known malicious redirector infrastructure. The document body, though heavily obfuscated, suggests a lure related to a 'blood typing game worksheet'. The primary attack pattern involves directing users to malicious external sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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.
  • 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://dafemum.ru/wix?keyword=blood+typing+game+worksheet In PDF document text
    • https://xajevopo.weebly.com/uploads/1/3/2/6/132682124/7716003.pdfIn PDF document text
    • https://nozijuga.weebly.com/uploads/1/3/4/6/134698325/pojelitigalagobek.pdfIn PDF document text
    • https://cdn.sqhk.co/tinipuded/gd3jiyi/kiki_s_delivery_service_cat_jiji.pdfIn PDF document text
    • https://tagudosalanuku.weebly.com/uploads/1/3/1/4/131452811/kazalugopegezobenode.pdfIn PDF document text
    • https://tedawubav.weebly.com/uploads/1/3/4/3/134376018/faxomubaduw.pdfIn PDF document text
    • https://cdn.sqhk.co/suvezadamut/halFPDu/kopuxoxexom.pdfIn PDF document text
    • http://mimivudarevi.scienceontheweb.net/ultimate_baccarat_strategy.pdfIn PDF document text
    • http://jamotovoxut.mywebcommunity.org/17580735321.pdfIn PDF document text
    • https://dufelawukada.weebly.com/uploads/1/3/2/6/132682042/1cd0089fd.pdfIn PDF document text
    • https://cdn.sqhk.co/gawukale/a2lhihb/72738047346.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/b260e13e-c560-4062-885f-706744ca3d89/2010_cobalt_maintenance_schedule.pdfIn PDF document text
    • http://wolobugoxew.myartsonline.com/samsung_dv45h7000ew_a2_service_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/98e5adcb-4af9-4cd5-bdc0-ce356e4ecaa8/how_to_increase_flame_size_on_gas_fireplace.pdfIn PDF document text
    • http://femasusatatovet.epizy.com/challenging_symmetry_worksheets.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e1326c33-55fd-4b4f-b7d4-517f78b68d07/what_is_the_focus_of_classical_management_theory.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c1661cdc-e8d3-4562-bb2c-f585cee9117e/xiwixisogiv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/45e46f36-92b3-48d9-bf95-68d0530b7f0c/dbt_one_mindfully_exercises.pdfIn PDF document text
    • http://gemebewi.rf.gd/nolidukugese.pdfIn PDF document text
    • http://tizeruxabono.onlinewebshop.net/ruziwuwuxujegigotalerine.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/72740d14-7cb2-4d09-b57d-8617eed050d1/lone_star_metal_detector.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a8f36135-4b50-4956-b742-ef3dec3368d8/2018_subaru_forester_2.5_i_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c07a9a89-51cf-4ac5-a80f-0f45ed938d2d/icse_maths_book_for_class_5.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c069d3d5-8f6d-4b5e-a6a2-ad97045eb176/sitej.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_off0000e82f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE82F 5680 bytes
SHA-256: 13b5f19074af16343f7f685e0a4b81908a781cef447902510ca2370573d0e8d6
font_01_sfnt_off0000fb79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB79 10772 bytes
SHA-256: a858e1288ce0be970c8a70e442e4b3e8a0378a36e8d72bede83b08f031dfc74c

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