Malicious PDF — malware analysis report

Static analysis result for SHA-256 efa748953fd59459…

MALICIOUS

PDF

72.8 KB Created: 2021-02-26 14:42:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 15897b10f297576b5334473fc0152285 SHA-1: c27ad5dd2d16340202f80dabb5e277d300a41621 SHA-256: efa748953fd5945948b5013e6bbcfe651cbabaee40635b06b53711c46a891aad
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.001 PowerShell

This PDF document was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier indicating maliciousness. The 'SE_CLIPBOARD_COMMAND_LURE' heuristic indicates the document likely instructs the user to copy and paste content into a command-line interface, a common technique to download and execute secondary payloads. The embedded URLs suggest a link farm used for distributing malicious content.

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://fokemale.ru/aws?utm_term=history+of+the+world+part+2+10+commandments PDF link annotation
    • https://cdn.sqhk.co/genizataxom/A3ghih3/learn_spanish_free_games.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380869/normal_5ff1e67128a20.pdfIn PDF document text
    • https://cdn.sqhk.co/noneniwetav/hchaJjj/dictador_20_year_solera_rum_colombia.pdfIn PDF document text
    • https://cdn.sqhk.co/vimexuda/jaicSjb/anime_guitar_games_apk_offline_free_download.pdfIn PDF document text
    • https://zusonuxegaza.weebly.com/uploads/1/3/1/4/131437774/datirabedebimitut.pdfIn PDF document text
    • http://sonifakeki.22web.org/superyacht_salary_guide_2018.pdfIn PDF document text
    • https://vexibalob.weebly.com/uploads/1/3/4/8/134896466/zupagexivepuja.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470038/normal_6023d32c4f5a0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383704/normal_5fde12e35fa63.pdfIn PDF document text
    • http://simimupaju.iblogger.org/xufumepagakelavejinibogaw.pdfIn PDF document text
    • http://beruvutekimeged.22web.org/wendys_nutrition_frosty_medium.pdfIn PDF document text
    • http://fesilax.22web.org/morimagevisozibafijadelij.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382189/normal_5feef4f92d72f.pdfIn PDF document text
    • https://cdn.sqhk.co/jutigurotow/eujaifM/the_escapists_2_pocket_breakout_apk_award.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://magekuj.rf.gd/free_printable_volume_of_rectangular_prism_worksheets.pdfIn PDF document text
    • https://s3.amazonaws.com/nuxepiduded/fluval_306_external_filter_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/mejifavo/17510393614.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ddea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDEA 5876 bytes
SHA-256: 0cf46342938b9b09af48b4a75c5490e6334669c55efb26f9a2eb892babae71c1
font_01_sfnt_off0000f1d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1D9 10584 bytes
SHA-256: 7e8f6614ccdcc429f22f8cbf2174c727c3a8656f576faa7541d69825938af01a

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