Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee7a425947b2ed50…

MALICIOUS

PDF

81.2 KB Created: 2021-03-14 23:20:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: f238e1226e078a1637aa981c44124d8e SHA-1: c0cb18a47e274414f5c824c38ff55077b72fec46 SHA-256: ee7a425947b2ed50b8790efd1ef91c0c0bfc84c75ea628ca29e62fe1618a4602
126 Risk Score

Malware Insights

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

The sample is a PDF file flagged by multiple heuristics and ML classifiers as malicious, specifically identified as a phishing trojan by ClamAV. It contains numerous embedded URLs, many of which point to disposable hosting and appear to be part of a link farm designed to redirect users. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, and the presence of external URIs indicates an attempt to lead the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://druttle.ru/award?keyword=human+anatomy+8th+edition+marieb+pdf PDF link annotation
    • http://vizit.store/27309229526eu7g7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447669/normal_5ff9eef3107a2.pdfIn PDF document text
    • http://form-lnstagramcopyrightservice.com/animal_personality_test4qh0d.pdfIn PDF document text
    • http://1ux.site/11937787217l6slj.pdfIn PDF document text
    • http://malespw.xyz/why_is_my_ninja_blender_blinkingrf3ph.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422180/normal_603f75a93c39b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387933/normal_60089b9bad8a6.pdfIn PDF document text
    • http://senteber.site/tojurugajewowacwt4l.pdfIn PDF document text
    • http://deromgroup.com/family_feud_switch_metacritic6p9jh.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410006/normal_5ffaece516a20.pdfIn PDF document text
    • http://neo-tp.ru/34065808350ydd4p.pdfIn PDF document text
    • http://smm-target.ru/chamberlain_clicker_keypad_instruction_manualfjgr6.pdfIn PDF document text
    • http://usesol.xyz/harga_sony_alpha_350_barup71fr.pdfIn PDF document text
    • http://idealicaitalia.website/beats_studio_3_user_guide121j8.pdfIn PDF document text
    • http://fherixq.com/12125522790nf86y.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/xukanomarexumu/2534983839.pdfIn PDF document text
    • https://s3.amazonaws.com/tadevewuju/56266782505.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d698c20c-0caf-4ad4-b282-7c07982557be/the_sims_3_patch_1.69_chomikuj.pdfIn PDF document text
    • https://s3.amazonaws.com/mipizaju/call_me_by_your_name_online_free_with_subtitles.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9c846d29-f31a-483c-ae95-c575980d26c4/technical_analysis_of_stock_trends_11th_edition.pdfIn PDF document text
    • https://s3.amazonaws.com/wufujudisu/tekiboguvosetuzavodap.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_off0000f722.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF722 5468 bytes
SHA-256: 5ffe06732d67251ad9943c4aa93ca2d85c82148ddcd258ed88c5244bc70d404b
font_01_sfnt_off00010993.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10993 13788 bytes
SHA-256: 7aa8a87dbcd5058fec699cf2f7aa50cb4a9e4c613922bdc39d4de43ad4b130f8

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