Malicious PDF — malware analysis report

Static analysis result for SHA-256 51a0d43b3c0a2316…

MALICIOUS

PDF

81.7 KB Created: 2021-03-02 18:30:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 62768a82b738335068daf7c817e51e8b SHA-1: cc1a26410e3d8cfa88bc29ab51daf566502dc573 SHA-256: 51a0d43b3c0a231643794655ab7ad2042f0da46bf8ddc1d7992ea5ef9a328059
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a significant portion pointing to disposable domains and identified as a link farm. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the high ML score strongly indicate malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the structure and URL patterns are consistent with malicious PDF lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://kuzutuzo.ru/123?utm_term=blades+in+the+dark+vampire+playbook PDF link annotation
    • http://wurijudopala.22web.org/jane_the_virgin_episode_guide_season_3.pdfIn PDF document text
    • http://sadesopawu.iblogger.org/tureduku.pdfIn PDF document text
    • https://tidemipevu.weebly.com/uploads/1/3/0/7/130740592/46194320e4635.pdfIn PDF document text
    • https://cdn.sqhk.co/matikefateri/hdHsXif/mortal_kombat_11_guest_characters_fatalities.pdfIn PDF document text
    • https://cdn.sqhk.co/demexadol/hchehdV/1281292851.pdfIn PDF document text
    • https://lepekogiba.weebly.com/uploads/1/3/1/6/131637498/xubajiwalawosu-gejuvikusu-viraloji-xodejorol.pdfIn PDF document text
    • https://cdn.sqhk.co/savunowudob/g2Zf1H0/35383563953.pdfIn PDF document text
    • https://cdn.sqhk.co/vovusupa/C9Uyjgf/washington_capitals_hockey_game_today.pdfIn PDF document text
    • https://cdn.sqhk.co/vasibejovej/hi7qhdo/robo_defense_full_version_free_download.pdfIn PDF document text
    • http://lexibanoma.iblogger.org/82695333461.pdfIn PDF document text
    • http://mir23.xyz/36118444274lu6um.pdfIn PDF document text
    • https://tiseparalav.weebly.com/uploads/1/3/4/7/134735838/tavofafawom-valafelo.pdfIn PDF document text
    • https://tuberosaguxe.weebly.com/uploads/1/3/1/4/131437792/dcb22fd22.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tegajapo.rf.gd/music_adam_lambert_ghost_town.pdfIn PDF document text
    • https://s3.amazonaws.com/muwemivumazulax/44444935303.pdfIn PDF document text
    • http://nudenagazosizav.epizy.com/informant_interview_define.pdfIn PDF document text
    • http://vinegufoxa.rf.gd/how_to_clean_harman_pellet_stove.pdfIn PDF document text
    • http://lipuwetaw.epizy.com/33065390069.pdfIn PDF document text
    • https://s3.amazonaws.com/tevigotu/45041961931.pdfIn PDF document text
    • http://zebofazedixa.rf.gd/68276187149.pdfIn PDF document text
    • http://sujosivetobifir.epizy.com/donne_charles_bukowski.pdfIn PDF document text
    • https://s3.amazonaws.com/wulotugadag/guidelines_liver_metastases.pdfIn PDF document text
    • https://s3.amazonaws.com/jowutoneranemuk/libatadawatagetodarovew.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001026e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1026E 5616 bytes
SHA-256: c91104a68cb57f04ed418a11c48fdb8402787cfe14cd26003ba1ade190db9c5e
font_01_sfnt_off00011561.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11561 10548 bytes
SHA-256: 6320bd3df7ba8cb32371d57f7ed79483ac3db0fc19281d31aed86c18523ac083

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