Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9c64c863ab14d4a…

MALICIOUS

PDF

80.0 KB Created: 2021-03-06 05:25:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 955951fd9c113634e2a77a28ce749ebd SHA-1: 183e7076d556100483d487ca9b198c5188ee67a0 SHA-256: e9c64c863ab14d4a1bccb50654313499cf018cccad027c65ab39125efa2d073f
126 Risk Score

Malware Insights

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

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable domains, indicating a link farm designed to redirect users to potentially harmful sites. The document body, though heavily obfuscated, contains metadata related to wkhtmltopdf and a keyword that may be part of a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • 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://nipisod.ru/award?keyword=fios+p265+remote+codes PDF link annotation
    • http://mixed-rootwork.com/kindle_model_d00901_will_not_turn_oneevce.pdfIn PDF document text
    • https://cdn.sqhk.co/baruduwege/frjcpji/scalextric_arc_pro.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370273/normal_6028f9873e4bf.pdfIn PDF document text
    • http://sovetnik53.ru/zusijasidofarajogopapelhigt.pdfIn PDF document text
    • https://cdn.sqhk.co/zowonefaso/ievWKzP/61340898491.pdfIn PDF document text
    • http://apparentlyopt.com/69164585883184jn.pdfIn PDF document text
    • http://verifiedbadge-lnstagram.com/why_do_students_choose_not_to_go_to_collegetec1e.pdfIn PDF document text
    • https://cdn.sqhk.co/jesupasuzoku/jgCjeRX/befimusomu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450727/normal_602c3fe57302e.pdfIn PDF document text
    • http://dfwshootersupply.com/vazaledujatibojezisanunup19x.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412591/normal_60081a94eeb5c.pdfIn PDF document text
    • http://bcpzonasegura10beta-viabcp.com/work_energy_power_practice_problemsdcdo3.pdfIn PDF document text
    • https://cdn.sqhk.co/vizejagojib/eBhijjT/wheel_of_fortune_game_online_lol.pdfIn PDF document text
    • http://persequen.com/how_to_train_your_dragon_2_trailer_in_hindik0m6p.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410013/normal_600044d17be50.pdfIn PDF document text
    • https://cdn.sqhk.co/jojikoxazew/dshcjVs/rum_balls_vanilla_wafers_honey.pdfIn PDF document text
    • http://thefortykuti.com/self-sustaining_definition_in_englishfxl1a.pdfIn PDF document text
    • http://masajsalonunuz.com/bendy_and_the_ink_machine_employee_handbookfe40d.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/besafefaf/sekuregogetugizulufe.pdfIn PDF document text
    • https://s3.amazonaws.com/tuxalowafokuvo/vivarugalusiralo.pdfIn PDF document text
    • https://s3.amazonaws.com/gowebabuxogiro/125497027.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_off0000f0e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0E6 5340 bytes
SHA-256: a894568c5f7b24bacc904e3879891380ea691630723e9d3e54d19c1b19f313b0
font_01_sfnt_off0001030a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1030A 15424 bytes
SHA-256: 009ba6deb425e6ea85830a78038e23e031e60d8dfcb7582eaa035ef474a1999a

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