Malicious PDF — malware analysis report

Static analysis result for SHA-256 c839364a189e1007…

MALICIOUS

PDF

74.9 KB Created: 2021-02-20 22:10:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 4fdddb2384d2ac672244ff80eae909ed SHA-1: 1d37e1fb84199c72d7c49c8f53e8f9d5eda38422 SHA-256: c839364a189e100730c9d8106aec5f0bf9e0c9a09c8c6f9a2a21c045ec644bfd
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. The embedded URLs point to various PDF files, likely intended to redirect users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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://druttle.ru/123?utm_term=lenovo+thinkpad+t430s+specifications PDF link annotation
    • https://zawasofolebu.weebly.com/uploads/1/3/4/9/134902788/gavowepajotu.pdfIn PDF document text
    • https://cdn.sqhk.co/zarepowake/jij0Yha/7694888275.pdfIn PDF document text
    • https://cdn.sqhk.co/kazamepa/Vggsrgc/does_frndly_tv_have_local_channels.pdfIn PDF document text
    • https://cdn.sqhk.co/boxepupovemu/81AvjhN/donkey_kong_arcade_dip_switch_settings.pdfIn PDF document text
    • https://cdn.sqhk.co/fiwujumejuf/Xe2ifij/zodowokixobebo.pdfIn PDF document text
    • https://cdn.sqhk.co/fexejikexew/ggehbx3/anthill_farms_comptche_ridge_pinot_noir_2015.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4401732/normal_5fdd223c41c62.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382614/normal_6019a22e84a81.pdfIn PDF document text
    • https://nijuvijoz.weebly.com/uploads/1/3/1/4/131408832/3476108.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480590/normal_5ff38c8dba667.pdfIn PDF document text
    • https://cdn.sqhk.co/fulaxanew/idHjicZ/tips_for_fall_guys_knockout_ultimate_gameplay_pc.pdfIn PDF document text
    • https://cdn.sqhk.co/kawiwitifa/jagG3iA/sky_red_button_games_on_virgin.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://golofup.rf.gd/18065398969.pdfIn PDF document text
    • http://bidavavaxekize.epizy.com/fibosoboporijudobamigun.pdfIn PDF document text
    • http://kalotiwinilobiw.epizy.com/govurowu.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_off0000e8aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8AA 5576 bytes
SHA-256: 80b6e2c1e7513bdf0c0e94bcfe022a0894fc6e55169e371d20e45154091c9c72
font_01_sfnt_off0000fbb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBB3 10336 bytes
SHA-256: e40aba4503e159351256907b9fb26e5de1e841ef46cefc78e86d5b5de29edcfd

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