Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b3831dfc7f4e2b5…

MALICIOUS

PDF

83.7 KB Created: 2021-05-13 05:56:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: dc12aa8cc74a94ff1629a3f40bfee10b SHA-1: 22a2e76282feda1a1c55fcbc233d47dcf5428a90 SHA-256: 8b3831dfc7f4e2b5d11ccfdc81dc563d10104fbde300aefafb0be1e5b64bf581
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains numerous URLs, many pointing to disposable hosting, and is flagged by ML classifiers as malicious. A critical heuristic indicates it's a phishing lure that instructs the user to copy/paste content into a command-line context, strongly suggesting an attempt to trick the user into executing a malicious payload. The presence of external URIs and the overall detection by ClamAV as Pdf.Phishing.Trojan point to a downloader or phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • 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://baarspo.ru/strik?utm_term=polycom+soundstation+2+ex+lcd+conference+phone+manual PDF link annotation
    • http://bamirajewenexo.medianewsonline.com/gelomogenobiveta.pdfIn PDF document text
    • http://konufij.22web.org/34001161204.pdfIn PDF document text
    • https://cdn.sqhk.co/rapovebakeb/ggUNhhb/pass_color_blind_test.pdfIn PDF document text
    • http://zapitexidij.mypressonline.com/gofamerovomolajebalasozi.pdfIn PDF document text
    • http://auto-agents.space/65404338359guqjv.pdfIn PDF document text
    • https://cdn.sqhk.co/xewimoziwuvo/Dehhdjf/29013103262.pdfIn PDF document text
    • https://cdn.sqhk.co/pujimuxuja/hfgdjjC/lg_smart_diagnosis_dryer_not_heating.pdfIn PDF document text
    • http://zoneeuro.pro/kepijijosijodasofon10drt.pdfIn PDF document text
    • https://cdn.sqhk.co/luginuwi/L2geiia/sindhi_biryani_recipe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://birabigipo.epizy.com/fijilegikujugubolel.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/96e84640-c2ff-41f5-9628-307610c18796/how_to_fix_samsung_freezer_handle.pdfIn PDF document text
    • https://s3.amazonaws.com/telasebisu/guns_germs_and_steel_episode_2_video_questions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c9f3de7d-ac42-4451-8e18-02702d6d154b/48803570231.pdfIn PDF document text
    • https://s3.amazonaws.com/bokexizometun/how_to_change_the_price_on_a_vending_machine.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6f798420-2666-4db8-8f27-5bb4b224c045/2006_ford_crown_victoria_repair_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ca69703c-1c1d-44b8-8840-577b1155e6b8/12330540345.pdfIn PDF document text
    • http://mepenaxuwijun.rf.gd/adobe_photoshop_cc_2020_tutorials_for_beginners.pdfIn PDF document text
    • https://s3.amazonaws.com/rizijubovapuk/22269902413.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f0f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0F2 5696 bytes
SHA-256: 9a3f3dcd787da93fe8ae22664bae5b6810b62bb077251b5303138f35c27d0325
font_01_sfnt_off0001043c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1043C 12072 bytes
SHA-256: e1b444d82e723c458e7d75ac5facab497140638e5a1a9aa19b0a7745f20e0cc1
font_02_sfnt_off00012bb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BB9 16204 bytes
SHA-256: 532315dfdc59b350d447ad91845dd8cc72a836e684f536ab9a4305dc5b53fb8e

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