Malicious PDF — malware analysis report

Static analysis result for SHA-256 99f6f4b3352a1c1e…

MALICIOUS

PDF

77.4 KB Created: 2021-03-02 23:07:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: bfdf39c148673a764b3ee3238cf877a7 SHA-1: 3349e34ba0401089e9eb173220835cb0a5f116f3 SHA-256: 99f6f4b3352a1c1e4f10dc91db43d35db7c71a475fc2cce1de71cfd54d8a4bf4
126 Risk Score

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. The presence of numerous embedded URLs, many pointing to disposable hosting and using UTM parameters, strongly suggests a phishing or link-farming operation. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating the document is designed to host a large number of links on potentially untrustworthy domains.

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://leonvi.ru/strik?utm_term=before+you+say+i+do+norman+wright+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4416653/normal_5fe8617e10fdf.pdfIn PDF document text
    • https://cdn.sqhk.co/xopigotax/JhfgfvD/kingdom_warriors_prayers.pdfIn PDF document text
    • http://vasakuso.sportsontheweb.net/future_english_for_results_3_answers.pdfIn PDF document text
    • http://xorabawik.medianewsonline.com/wamivuvezabozikikan.pdfIn PDF document text
    • http://dakajak.medianewsonline.com/netinutonagezixesowu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368768/normal_602ed10367e93.pdfIn PDF document text
    • http://fibipowokogo.sportsontheweb.net/what_is_philosophy_in_life_means.pdfIn PDF document text
    • https://cdn.sqhk.co/zezinojox/ggnTge2/home_painting_companies_near_me.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4467612/normal_5fe4882bbe2fa.pdfIn PDF document text
    • http://biwedujurar.mywebcommunity.org/lokufo.pdfIn PDF document text
    • http://tepugorotewole.medianewsonline.com/honda_bf90_service.pdfIn PDF document text
    • http://pazadixokumox.sportsontheweb.net/behind_closed_doors_telenovela_actors.pdfIn PDF document text
    • https://cdn.sqhk.co/xaselavub/iejewdf/pisefaxafodikikurivivu.pdfIn PDF document text
    • http://gekifek.scienceontheweb.net/what_is_cutover_testing.pdfIn PDF document text
    • https://cdn.sqhk.co/netimupoxojo/g3ifThe/hockey_statistics_book.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://weparaxopulo.atwebpages.com/vumenejekud.pdfIn PDF document text
    • https://s3.amazonaws.com/vitelitubovuluj/gisojuzorawul.pdfIn PDF document text
    • https://s3.amazonaws.com/jedobufudajewu/meramutejevuvarisurobus.pdfIn PDF document text
    • http://zowofiz.myartsonline.com/brother_ds-720d_user_manual.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_off0000e3d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3D9 5548 bytes
SHA-256: 76206a449c93c48faf0f2042f3b2717a29e7b2e0b4ab5eab59f13c312e29a2c9
font_01_sfnt_off0000f6a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6A4 10396 bytes
SHA-256: 8b94ed32e461fafd7e845a4205468d7b6df90b1d155742a07e2d2a8c190233d7
font_02_sfnt_off000119d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119D0 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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