Malicious PDF — malware analysis report

Static analysis result for SHA-256 97efa910480aedec…

MALICIOUS

PDF

78.2 KB Created: 2021-03-28 13:50:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 40b11a18b550cef6e0c6e63be01b812b SHA-1: 567bbe61f8d3f724f90026673ad4d9cdcd4677b7 SHA-256: 97efa910480aedecc0bbf3805aa6706ce831cde5a69365ad378cb9fb52f2cc51
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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
  • 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=forgotten+realms+deities+favored+weapons PDF link annotation
    • https://bolowotusupiwam.weebly.com/uploads/1/3/5/3/135300352/14000a95feb.pdfIn PDF document text
    • https://cdn.sqhk.co/xugumewaz/Figifwa/download_carx_drift_racing_2_apk_only.pdfIn PDF document text
    • https://cdn.sqhk.co/goduwonon/jdr1gdf/xixipitafi.pdfIn PDF document text
    • https://cdn.sqhk.co/batovafakupo/gfjifLt/xirukunemizez.pdfIn PDF document text
    • https://cdn.sqhk.co/nowonipewo/cxhcigd/the_wolf_97._3_fm_nebraska.pdfIn PDF document text
    • https://pobanuritixejun.weebly.com/uploads/1/3/4/6/134601578/2906682.pdfIn PDF document text
    • https://nivewasivok.weebly.com/uploads/1/3/4/4/134479385/2603692.pdfIn PDF document text
    • https://cdn.sqhk.co/remowiwa/YJdZieT/gym_exercises_for_beginners_female.pdfIn PDF document text
    • https://bazugibeb.weebly.com/uploads/1/3/1/4/131453150/nujakevudidosugal.pdfIn PDF document text
    • https://cdn.sqhk.co/patemugimej/vgcDkdG/gumball_watterson_mom.pdfIn PDF document text
    • https://cdn.sqhk.co/zadexona/052jftB/8724364444.pdfIn PDF document text
    • https://vufepuxo.weebly.com/uploads/1/3/4/5/134522835/gijiv.pdfIn PDF document text
    • https://cdn.sqhk.co/letareximo/dfWiahb/clicker_mine_mania_2_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/dudexobexine/jaBje7b/2070815840.pdfIn PDF document text
    • http://xigotazuwal.iblogger.org/7084800358.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/vonuxagupeduze/xopemesuwoxilupiw.pdfIn PDF document text
    • https://s3.amazonaws.com/toliwudalamem/bhajan_video_bhojpuri.pdfIn PDF document text
    • https://s3.amazonaws.com/vexosafugunu/how_to_monitor_power_usage.pdfIn PDF document text
    • http://xizilagitakov.epizy.com/dowipazewaginul.pdfIn PDF document text
    • http://vaxinot.epizy.com/lumbar_spondylolisthesis.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_off0000f223.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF223 5468 bytes
SHA-256: 76f8049f464e21a1eea03465e4839f8047d3f36523986dbcaef1872360bd68e4
font_01_sfnt_off000104c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104C5 11296 bytes
SHA-256: b3e0ddabe4eef14a4d4fd3aa0b4f5eda4ed9e71901a3d79876ed724d7d979ff7

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