Malicious PDF — malware analysis report

Static analysis result for SHA-256 36d336b0131ad283…

MALICIOUS

PDF

81.5 KB Created: 2021-03-04 12:41:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: c6f9755ad790ac1450e5b9c2e4d7481f SHA-1: 768bf5c7c8d06042fcd7a6ac77e9fe16036d3b92 SHA-256: 36d336b0131ad283c02b1163b625dba77c6e05b9cee4a06ba8e30b1f000d59e4
134 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many pointing to disposable domains, and is flagged by ML classifiers and ClamAV as malicious. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a tactic to disguise malicious links within a seemingly legitimate document structure. The presence of external URIs suggests an attempt to redirect the user to malicious sites for further exploitation.

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 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://mezovuduw.ru/wix?keyword=jeux+apk+mod+unlimited+money PDF link annotation
    • http://sanamikegimelab.22web.org/adobe_reader.pdfIn PDF document text
    • http://abzac.me/vowamusoxuresupafara8kopx.pdfIn PDF document text
    • http://rijebipimaba.getenjoyment.net/mitsubishi_mr_slim_par-jh050ka_user_manual.pdfIn PDF document text
    • https://cdn.sqhk.co/juzurupivepo/jdchdjd/kodiak_bear_bites_chocolate.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417997/normal_5fc858dd4c100.pdfIn PDF document text
    • https://cdn.sqhk.co/wekaradukuve/heqVqhc/first_aid_kit_emmylou_lyrics.pdfIn PDF document text
    • http://samozanyat.info/learn_python_for_data_science_udemyq2qap.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497650/normal_6038003512b01.pdfIn PDF document text
    • http://copyright-services-us.com/funabuxidoboveresagivudnxml1.pdfIn PDF document text
    • https://cdn.sqhk.co/xugikokazo/jfheggP/download_audistar_mobile_indonesia_apk.pdfIn PDF document text
    • http://azakalaza5.xyz/how_to_descale_k_eliterzj13.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374986/normal_601e35d2e24e5.pdfIn PDF document text
    • https://cdn.sqhk.co/dusimefosix/7h8Huha/94905983402.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://maxipora.rf.gd/51942975137.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_off0000fc7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC7E 5056 bytes
SHA-256: 73474407ea0f466730969c717486bfd9f4e11c57b76b998ac924cb7c122252f9
font_01_sfnt_off00010db4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DB4 13712 bytes
SHA-256: 03edc77fa8a8c1fa72f7f9d0995a4213228d993ef01ab5329e2a0fee8aa3f788

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