Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcee07151458187d…

MALICIOUS

PDF

93.2 KB Created: 2021-03-03 23:40:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-13
MD5: b1480248483e9481c252887da46948e0 SHA-1: 5696ef2385a140e92728725d433b013b48e2ebfd SHA-256: dcee07151458187d8534d8754c0a14c477296f6f8bc7e6c9d55d378e6b12159a
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating maliciousness. The document body and embedded URLs suggest a lure related to product searches, directing users to various domains that host further PDF files. The presence of numerous external URIs and link farm characteristics indicates a likely phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://botokaw.ru/123?utm_term=mr+coffee+12+cup+coffee+maker+red PDF link annotation
    • http://lamanixumerad.mypressonline.com/17700407016.pdfIn PDF document text
    • https://cdn.sqhk.co/bufutoje/ggiW1jf/cnc_milling_tools_for_sale.pdfIn PDF document text
    • https://cdn.sqhk.co/kezixowog/ihijvjg/hidden_journey_adventure_puzzle_quest.pdfIn PDF document text
    • https://cdn.sqhk.co/xiladuxe/ljgJ4id/rutusudejeweraparibegakus.pdfIn PDF document text
    • http://tonorubur.22web.org/65888451769.pdfIn PDF document text
    • http://fikunigogijori.22web.org/animal_worksheet_islcollective.pdfIn PDF document text
    • https://cdn.sqhk.co/lajefage/ahftjcT/fegedegijotusagisifizutow.pdfIn PDF document text
    • https://cdn.sqhk.co/sevigexew/Bichehi/kapuruvabuxujufasodiju.pdfIn PDF document text
    • https://cdn.sqhk.co/xipitufekaru/jBuclQ7/zitufi.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://popeganezawojeg.rf.gd/year_planner_template_excel.pdfIn PDF document text
    • http://zipituvopedisi.rf.gd/huffy_nassau_cruiser_bike_24.pdfIn PDF document text
    • http://juvogexef.rf.gd/best_waffle_maker_for_home_in_india.pdfIn PDF document text
    • http://magegefopo.atwebpages.com/survival_gear_for_alone.pdfIn PDF document text
    • http://toterow.rf.gd/89309628704.pdfIn PDF document text
    • http://bogalibamadom.myartsonline.com/2338089315.pdfIn PDF document text
    • http://simanij.rf.gd/sozopuxo.pdfIn PDF document text
    • http://gafodix.myartsonline.com/tomuwikuxifotaxurixuka.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_off000123c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123C0 4992 bytes
SHA-256: c9964f0c0bd6739cc3f9054612160402a1ea89c1edaf721661e1318f1109de6d
font_01_sfnt_off000134c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134C0 10696 bytes
SHA-256: ad84a5aa80cd6b44d6a4eb34c654f7e8963756cc8c5eb2cc495ff20bc29e585e
font_02_sfnt_off0001593c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1593C 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230

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