Malicious PDF — malware analysis report

Static analysis result for SHA-256 331d2dfe9c2d1fad…

MALICIOUS

PDF

76.5 KB Created: 2021-05-07 01:41:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 116c49679ce54180d6c4c48686b0ee9a SHA-1: 3389b4c72ea4e5af6b319609cc148ac1180efe3d SHA-256: 331d2dfe9c2d1fad4807199032a8cdc2ae1fbc1f8219de2fac92f343f09efdb1
206 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment T1204.002 Malicious File

The PDF contains heuristics indicating it is a link farm and uses a clipboard command lure, instructing the user to paste content into a shell. This suggests an attempt to trick the user into executing commands, likely to download a second-stage payload from one of the embedded URLs. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://jumiwimov.ru/strik?utm_term=gopro+hero+3+reset+password+wifi
    • http://verification-help.business/smithsonian_channel_air_disasterspfmj0.pdf
    • http://formulamoney.top/xibedakaxotawemulyce8v.pdf
    • http://normaa-id.com/west_bend_microwave_em925ajw-p1_manualy0t2n.pdf
    • http://xepiluwe.22web.org/79872799871.pdf
    • http://ig-support-service.com/what_is_the_generic_structure_of_report_text_adalahx9vta.pdf
    • http://sellforce.ru/havoc_brother_songs_in_tamil5volp.pdf
    • http://lnstagram-badge-verification.com/pamutapixegaluxozurotexh2yz.pdf
    • http://damomemisogadex.iblogger.org/43889715879.pdf
    • http://redpandarecycling.com/strikemaster_40v_ice_auger_for_salekem05.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://e46eb8ae-11b5-47af-91b5-79e2db369635.filesusr.com/ugd/f84671_0a0089fd525441f9bba2caa01dee32b5.pdf?index=true
    • http://lebidaxelu.epizy.com/56279787398.pdf
    • https://d62ff7d9-aefc-4ab8-8cdf-af38868aea16.filesusr.com/ugd/54b9a1_a31b448514d24a3097acbc16ee0b05cd.pdf?index=true
    • https://abaaaae4-9231-44fc-b12c-ad55ebcc68e7.filesusr.com/ugd/2ca09c_c19487d10c22459ea2f9963c9a7c0f76.pdf?index=true
    • http://lunujebof.rf.gd/pre_engineered_buildings_design.pdf
    • https://69a7f268-727d-4112-ba4f-a3538cc856be.filesusr.com/ugd/9a0d60_96325c47f3064a31adb247d8e0cdd28d.pdf?index=true
    • https://6ae5a9c1-8526-45f7-b068-03ddf2465b28.filesusr.com/ugd/87f732_461d412d0ea443838ad659d81fb82747.pdf?index=true
    • https://0feddc0e-03bc-46a3-a741-45303deff239.filesusr.com/ugd/6ea6a2_3dfe23dd81ab4b238f3c7138d2c95458.pdf?index=true
    • http://xofuzugavup.epizy.com/honda_dirt_bike_parts_store_near_me.pdf
    • https://73856814-13bb-4d44-aeaf-752cce6ba6bd.filesusr.com/ugd/a0d21a_22c32562e1264f4dbdf7f16631102b07.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee2d.bin
639792fa129602d2bd2f04e111cda4f3055bf3c5a9755860b292b14e35f6f743		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEE2D 5384 bytes
font_01_sfnt_off0001008e.bin
8b42f3b085e2f86f8cb98d7826cdd82dd3e1cc904afa2a7f9c407548ae1bea73		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1008E 10712 bytes

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