Malicious PDF — malware analysis report

Static analysis result for SHA-256 d74fa3709e8dc215…

MALICIOUS

PDF

80.6 KB Created: 2021-02-05 11:43:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 63a6dfaa14a2ccd7d6c7f4db3357a7bf SHA-1: 9f69eefa5729b4bf239b5858ba055e796fc862f7 SHA-256: d74fa3709e8dc215c473647d7146eca437ef71dcfab0d691662e2881b4681262
126 Risk Score

Malware Insights

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

The sample is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it functions as a link farm on disposable hosting. The embedded URLs point to various domains, suggesting an attempt to redirect users to potentially harmful content. Although no scripts were explicitly extracted, the PDF structure and numerous external links strongly suggest a phishing or malware distribution vector, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jacksth.ru/123?utm_term=pathfinder+races+with+strength+and+charisma+bonus PDF link annotation
    • http://jewlgems.com/set_phasers_on_stun82z0c.pdfIn PDF document text
    • http://bottlechainworld.com/lelinunupitijunet226w7.pdfIn PDF document text
    • https://cdn.sqhk.co/dodagirojep/YlRje6E/80835491289.pdfIn PDF document text
    • http://store50off.info/zoxomotezesanoni8x4j7.pdfIn PDF document text
    • http://particulieres-societegenerale.best/gujajosusexibomopegisazopwew.pdfIn PDF document text
    • https://nopeludaseji.weebly.com/uploads/1/3/3/9/133986928/3166281.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4500208/normal_5fff123c75ba6.pdfIn PDF document text
    • https://milavunaxowe.weebly.com/uploads/1/3/4/7/134717052/9bf3b2a34e03.pdfIn PDF document text
    • http://premiumpornclips.com/ms_pac_man_maze_madness_ps452iuv.pdfIn PDF document text
    • http://antonio-ita.space/libixogunipan0mjs.pdfIn PDF document text
    • http://itverys.space/mesiloroxotemaxijofosan2gyn.pdfIn PDF document text
    • https://cdn.sqhk.co/xenumobavun/heZifhd/wofamiwem.pdfIn PDF document text
    • https://xapebetilozeze.weebly.com/uploads/1/3/0/8/130873864/6156752.pdfIn PDF document text
    • https://cdn.sqhk.co/tudusiki/h2jd3qT/clash_of_zombies_heroes_game_apk_download.pdfIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/xazarujokemus/kendrick_lamar_backseat_freestyle_music_video.pdfIn PDF document text
    • https://s3.amazonaws.com/petikamov/zuvibatevamodum.pdfIn PDF document text
    • https://s3.amazonaws.com/baposivarabuj/vifiwapowosipunobog.pdfIn PDF document text
    • https://s3.amazonaws.com/penefelomiju/15759156025.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://www.gnu.org/licenses/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off0000e45b.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xE45B 14320 bytes
SHA-256: 203d1dd6a581d2e79db71038250d38ca59ca15223c5edb9b96f6500c8acfaaf2
font_00_sfnt_off0000d14e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD14E 5636 bytes
SHA-256: 69e4aa58ec27981522e11a1433f17379af79193ab306e315da5d84df1298c923
font_02_sfnt_off00010ce0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CE0 10952 bytes
SHA-256: 43a2ef286391add4b8a9478e1d64897e7d0dbdfb6b21f0de33651dc921a37df3

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