Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0f66f36d366f791…

MALICIOUS

PDF

79.6 KB Created: 2021-03-04 14:57:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: d744707b728fd3d51516fdea82151551 SHA-1: 9c9f7cf675f47ce224fc0880d8b074242706c48e SHA-256: a0f66f36d366f791d0cfbb8c8538078a87c67426f481dcc20fb7ea3faf5dfd2f
126 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which point to link farms hosted on disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body, though partially corrupted, suggests a lure related to computer graphics or guides.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://leonvi.ru/award?keyword=como+hacer+una+linea+del+tiempo+en+computadora PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4459479/normal_602fbcc9b7d78.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473415/normal_5fe4018a5c0bf.pdfIn PDF document text
    • https://cdn.sqhk.co/saseponirifa/fNLigib/84509096875.pdfIn PDF document text
    • http://wifunagidoli.mypressonline.com/how_to_apply_decals_wet.pdfIn PDF document text
    • http://didazema.mypressonline.com/9491222799.pdfIn PDF document text
    • https://cdn.sqhk.co/rarirawibowo/1eYjdhg/light_trails_ios_app.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367903/normal_5ff64e2bd6cfc.pdfIn PDF document text
    • https://cdn.sqhk.co/vonofuguniti/LjfBgez/logowemek.pdfIn PDF document text
    • http://zobabikox.medianewsonline.com/the_lord_of_the_rings_complete_book_series.pdfIn PDF document text
    • https://cdn.sqhk.co/fakameratexe/icictmQ/mystic_forest_live_wallpaper.pdfIn PDF document text
    • https://cdn.sqhk.co/sabiwizi/tieyghU/stickman_parkour_runner_platform_epic_ninja_simulator.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/minabiwa/voluntary_demotion_letter_to_employer_template.pdfIn PDF document text
    • https://s3.amazonaws.com/mipizaju/identity_access_management_policy_template.pdfIn PDF document text
    • https://s3.amazonaws.com/zunewidimem/48726312086.pdfIn PDF document text
    • https://c4bedd8b-a3e9-4aa8-9751-a6fde4035b7e.filesusr.com/ugd/037f08_e0737937312844f6953e95834814c000.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/votubukaxogilix/world_of_warcraft_bfa_blacksmithing_guide.pdfIn PDF document text
    • https://3c1efe6f-6e34-41bb-a2c4-2be85dd3cb33.filesusr.com/ugd/41f880_4d1fb9973a2e44f995661c8e71733e20.pdf?index=trueIn PDF document text
    • https://5a8aee2d-3d68-4c09-98ed-743c9c56d6fd.filesusr.com/ugd/460efe_857f0ea0464b4981ad8a33c46be20a27.pdf?index=trueIn 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_off0000f7ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7BA 5040 bytes
SHA-256: ff666b8420f5f85896667b1c626906cfffc6086760288819e828b7c90d474d19
font_01_sfnt_off000108a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108A5 11976 bytes
SHA-256: a1f29382931cf363974b98bd162fc3394deb182f6b66f8008666b8c5ac49be56

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