Malicious PDF — malware analysis report

Static analysis result for SHA-256 944d151525b1d3bc…

MALICIOUS

PDF

82.0 KB Created: 2021-03-05 08:48:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: f5bc8c03f864e97ebb23aa2ed8a49ae7 SHA-1: 199e1479b4a17e6599e828b90191b25db8c8acd9 SHA-256: 944d151525b1d3bcad27ca2f102285c62c38ba86390b423b26161f5ec8488f69
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://baarspo.ru/strik?utm_term=tv+show+pitch+deck+template PDF link annotation
    • https://cdn.sqhk.co/kupawusel/iaXCj36/fists_of_fury_achievement_witcher_3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413475/normal_6026d546e8c0d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465548/normal_5fc68e6d6844d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453729/normal_600dd013e4f22.pdfIn PDF document text
    • https://cdn.sqhk.co/nugizape/yhg9Rhj/96642446187.pdfIn PDF document text
    • http://fujigukatujewu.medianewsonline.com/bowate.pdfIn PDF document text
    • https://cdn.sqhk.co/natokaze/Qhijgij/42387493373.pdfIn PDF document text
    • https://cdn.sqhk.co/jafiwimeg/Dihbgg0/ultimate_jungle_simulator_mod_apk_revdl.pdfIn PDF document text
    • http://puvepum.getenjoyment.net/sikisopelipexozufi.pdfIn PDF document text
    • http://nejevefivi.mypressonline.com/4414184981.pdfIn PDF document text
    • http://gakagebir.mypressonline.com/average_salary_for_graphic_designer_in_chicago.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413967/normal_5fedcf58027c2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4491432/normal_5fcede8cc18a5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376098/normal_601b955e034e2.pdfIn PDF document text
    • https://cdn.sqhk.co/peluxisomex/jiRjeii/90536258423.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482418/normal_5fd8fa691ac52.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/lijopavexanuse/avengers_assemble_soundtrack_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3cc5764a-2963-445e-80eb-3de80db967aa/boy_in_the_striped_pajamas_ending.pdfIn PDF document text
    • https://s3.amazonaws.com/zupenafud/be_careful_cardi_b_video.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c8bb8511-83e5-4f9d-b91e-2ca9a180d716/history_of_the_singer_201_2_sewing_machine.pdfIn PDF document text
    • https://s3.amazonaws.com/waxegatulo/29916799318.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7fee2400-1aa7-48d6-b494-1a0dc8c2eed7/88184964789.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a970360e-0b47-4912-8447-b48f04d6dbe0/gigopamumopezuzonozot.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_off0001019d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1019D 5380 bytes
SHA-256: 762a02028251b9f3dc43d7475aa93d27a5c9663c783cff8aedf95bab1f6203b6
font_01_sfnt_off000113da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113DA 11336 bytes
SHA-256: 4f76d97642915de65bac24f7d493814e05b9d965581a7c6de19a0b502eaafb1d