Malicious PDF — malware analysis report

Static analysis result for SHA-256 9fd4ec2694fb46b2…

MALICIOUS

PDF

97.9 KB Created: 2021-03-06 02:49:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: f781a1dfd07c5936d450ae777133ced4 SHA-1: ac1bd98a50b59bf82cbd1692f71e6e87539a517e SHA-256: 9fd4ec2694fb46b2f14383d5093b5a371d4850ab9cdf7b67ffbdcdad6f1f97a4
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with at least one, 'https://fokemale.ru/wix?keyword=yamaha+rx-a1050+service+manual', appearing to be a lure for a service manual. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests the document is part of a link farm designed for disposable hosting, further supporting a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://fokemale.ru/wix?keyword=yamaha+rx-a1050+service+manual PDF link annotation
    • http://custits.space/circulatory_system_worksheet_answers3bhm4.pdfIn PDF document text
    • http://nubatevujonuw.mygamesonline.org/vox_tonelab_le_manual.pdfIn PDF document text
    • http://jusukigib.sportsontheweb.net/dominos_pizza_allergy_list.pdfIn PDF document text
    • http://giwitap.getenjoyment.net/xonetububuvasaliriwinotum.pdfIn PDF document text
    • http://kurs1.xyz/how_to_build_a_glider_rocker_benchsntab.pdfIn PDF document text
    • http://mojadejazisapa.sportsontheweb.net/jotul_f_600_review.pdfIn PDF document text
    • http://bigpleasure.ru/42718806722ipx0r.pdfIn PDF document text
    • http://gemajelibetojup.scienceontheweb.net/how_to_reset_mitel_5312_ip_phone.pdfIn PDF document text
    • http://copyright-rules-help.com/brainstorming_methodsh9fnu.pdfIn PDF document text
    • http://wewogokuwidu.mywebcommunity.org/what_is_the_rarest_nascar_diecast.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
    • https://a6132035-7465-4fe4-be4e-2faa96c22dab.filesusr.com/ugd/cf950b_0566888a441c40618c69f7bc9dcd8692.pdf?index=trueIn PDF document text
    • https://45f61934-b4a1-4335-a9e3-e142d9465b5b.filesusr.com/ugd/0dd040_3c53c7914cc64d598c6bd866a203c15d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/godoremitiwuja/ranupusonekalifebirivura.pdfIn PDF document text
    • https://s3.amazonaws.com/bikikanafopavu/82823285424.pdfIn PDF document text
    • https://86a9da1b-0b57-4b35-a77a-523886b904cd.filesusr.com/ugd/0d9a50_ff4b6b6a7fe749b2a55aa5c23e0f6cb9.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/genedonapubefe/vowipizorabimewotaxax.pdfIn PDF document text
    • http://donijexufenu.onlinewebshop.net/kisulodobejodazizelodag.pdfIn PDF document text
    • https://d0bf7e8b-5449-41c0-93e9-161603c0719f.filesusr.com/ugd/197ed4_fe143c96d6ec4c3892c9d17b81d841d2.pdf?index=trueIn PDF document text
    • https://ab60d57a-1f92-408f-9079-0b325776b613.filesusr.com/ugd/724fb5_fc0c11e45379442f8e9492862b2b7868.pdf?index=trueIn PDF document text
    • https://eee5dff6-7331-416e-acdf-593d0c386862.filesusr.com/ugd/21e9e0_d3ba56a3cfe446e3819e4fd8b6406d33.pdf?index=trueIn 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_off000137a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137A5 5172 bytes
SHA-256: 0a4483455fed52efd3492bbc7edfd313de26fe72a8afcba61604eedc84f1302f
font_01_sfnt_off0001491b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1491B 10164 bytes
SHA-256: db20f446d9c1c3da63dbf5d164a33770434d1c09661610ecbfb0c27df0896a44
font_02_sfnt_off00016bb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16BB6 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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