Malicious PDF — malware analysis report

Static analysis result for SHA-256 18b855335a730057…

MALICIOUS

PDF

84.2 KB Created: 2021-05-14 15:49:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: e04cde44beb6d64b18b5316b92a7be60 SHA-1: ec9eb276d547cf732ec56823901d0d0735eb12f4 SHA-256: 18b855335a730057c890f2017f39cae9e9d62e7559aa8112f4d1f1b573c531f0
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to disposable domains and are likely part of a link farm or phishing campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan. The embedded URLs suggest an attempt to redirect users to malicious sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://jottigo.ru/strik?utm_term=how+to+learn+excel+formula+vlookup PDF link annotation
    • https://cdn.sqhk.co/gimexigerub/3jchgh1/one_piece_treasure_cruise_wiki_tier_list.pdfIn PDF document text
    • https://vebajixumese.weebly.com/uploads/1/3/4/4/134483039/2c2eb442a81fc3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415951/normal_5fdbc6ecac490.pdfIn PDF document text
    • http://svarka-aurora.online/lord_i_need_you_chords7tuyt.pdfIn PDF document text
    • http://dle-tpl.site/61097555146shsb8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466135/normal_5fd8751b601be.pdfIn PDF document text
    • https://norusukesalija.weebly.com/uploads/1/3/4/3/134356509/7d7bcfb9e6bb.pdfIn PDF document text
    • https://tojoniwov.weebly.com/uploads/1/3/4/6/134602819/gibemetorej.pdfIn PDF document text
    • https://bevereka.weebly.com/uploads/1/3/0/7/130739533/wemifatujip.pdfIn PDF document text
    • http://shopmzm.site/nagefutiron450k.pdfIn PDF document text
    • http://topsale.pro/boat_conformation_axial_equatorialkm1r8.pdfIn PDF document text
    • http://maxist.ru/tusuwogatikopusufejuyn3p.pdfIn PDF document text
    • https://cdn.sqhk.co/keropolor/iegjkji/42056435270.pdfIn PDF document text
    • https://cdn.sqhk.co/pafatewodoju/jcpjijf/nissan_skyline_r34_wallpaper_hd.pdfIn PDF document text
    • http://vinnipoh.space/fugazobegejou4n83.pdfIn PDF document text
    • https://mijebekebune.weebly.com/uploads/1/3/4/0/134017127/zotoxu.pdfIn PDF document text
    • https://cdn.sqhk.co/reriwoduriju/jgdjcDL/47368355449.pdfIn PDF document text
    • http://yozi.store/dezelifosamomepeloknkf73.pdfIn PDF document text
    • http://yarrebitteh.online/sonevanudadukarasvc0ad.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://34184745-b1ec-4725-b105-60c94cc90871.filesusr.com/ugd/63369f_3edd9aa8195b41358b694026e59fc176.pdf?index=trueIn PDF document text
    • https://df1882fa-13c5-42f1-8438-577935b594b9.filesusr.com/ugd/91932b_83fdcf8fdc1b4475b0d9ea68ae029285.pdf?index=trueIn PDF document text
    • https://67d298e0-85f4-4ad4-bf36-e1ac857e42fc.filesusr.com/ugd/b6bf5b_4821fdbabf9547a68028c60d51800620.pdf?index=trueIn PDF document text
    • https://fa53e508-d88d-41cb-897c-7a5b6f1bfcc3.filesusr.com/ugd/361045_a3326cac05bd4e9982ea359f6841e695.pdf?index=trueIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fae0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAE0 5060 bytes
SHA-256: 741fe753610b574ff68441979c22004ba04f8993ccc3fd40fff4ec9026481ffa
font_01_sfnt_off00010c13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C13 11828 bytes
SHA-256: 17026f7950ea401e7c8c601e69f8624ad1b1ccb1441b52fd730b834770f5fa24
font_02_sfnt_off00013488.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13488 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176