Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb07ca4adbb62448…

MALICIOUS

PDF

79.8 KB Created: 2021-04-05 20:49:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2c411d8f00342316a5e84776a2311ebe SHA-1: 5815db1c6b7a6ead9e67999cbece115525c443cc SHA-256: fb07ca4adbb62448d2a8f91e488bf5528843c1b00d0489660a93d86c2e8fe1bb
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable hosting or link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://botokaw.ru/award?keyword=degrees+of+comparison+of+adjectives+and+adverbs+exercises+pdf
    • https://cdn.sqhk.co/tumosirewuw/ijbRZgd/21274413213.pdf
    • https://kofiwesufe.weebly.com/uploads/1/3/4/7/134748014/ccc3c93af1bba3.pdf
    • https://fiwisito.weebly.com/uploads/1/3/4/7/134715438/171c90bac3.pdf
    • https://static.s123-cdn-static.com/uploads/4366017/normal_5ffd75d143099.pdf
    • https://cdn-cms.f-static.net/uploads/4373508/normal_6009d8d53a51c.pdf
    • https://cdn.sqhk.co/texaxonaguzo/eEoidjb/59381275050.pdf
    • https://cdn-cms.f-static.net/uploads/4453335/normal_601833591bb86.pdf
    • https://static.s123-cdn-static.com/uploads/4410965/normal_600592669811c.pdf
    • http://sutonazijusi.iblogger.org/which_is_best_design_software_for_mechanical_engineering.pdf
    • https://cdn.sqhk.co/zisujidixa/RLYvKic/64404027602.pdf
    • http://madalez.22web.org/contemplate_definition_law.pdf
    • https://duzuvopewawufos.weebly.com/uploads/1/3/4/4/134491429/xezudoxuralugire.pdf
    • https://cdn-cms.f-static.net/uploads/4375704/normal_60665ef7ed284.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/vetamedisoz/firewall_software_full_version.pdf
    • https://uploads.strikinglycdn.com/files/07960f42-177f-416c-b9c4-874f3fdc586c/work_and_power_activities_for_middle_school.pdf
    • http://wepinipinalojud.epizy.com/nnat_test_grade_2.pdf
    • http://sazuronami.epizy.com/paises_y_nacionalidades_en_frances.pdf
    • https://uploads.strikinglycdn.com/files/c6f87e86-1867-483e-a5eb-783d7005700e/bekizowutoboju.pdf
    • https://s3.amazonaws.com/kujapomib/dikav.pdf
    • https://s3.amazonaws.com/zewimu/22006137076.pdf
    • https://s3.amazonaws.com/kitakilesa/bottle_flip_3d_cheat.pdf
    • https://uploads.strikinglycdn.com/files/462060d7-a203-4977-aaf6-6bf88535d7f6/14550504676.pdf
    • https://s3.amazonaws.com/dusined/fortnitemares_challenges_part_2_guide.pdf
    • https://uploads.strikinglycdn.com/files/aeeb9dfa-6997-4637-bbbe-8649c419936d/how_many_episodes_will_be_in_attack_on_titan_season_4.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df08.bin
a5641cd5474f12bd235ae5a0e228d85e59493f5873e9926e509d9df4727abed5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDF08 5784 bytes
font_01_sfnt_off0000f2c2.bin
b75f3287c92c0c003faa6813c0c068052f40e3ece9d391b1eb9ed61d24f01bc3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF2C2 11448 bytes
font_02_sfnt_off000119de.bin
61761e6c71fdd980502ce8a3a8cbf9590216241eb9eabe72fdf309a1c23cd3c2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x119DE 16096 bytes

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