Malicious PDF — malware analysis report

Static analysis result for SHA-256 f16d606569cb255a…

MALICIOUS

PDF

70.5 KB Created: 2021-03-14 10:04:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 8381aa9d4cebe4325d078937b79ebf45 SHA-1: e0524d5a989fdf06d65f25f5ae143029de9e9bae SHA-256: f16d606569cb255a0186be6e9e01cde7bc375aff1b2cf0c10c58d8153b9141ae
184 Risk Score

Malware Insights

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

The sample was flagged by multiple critical heuristics, including ML classification and ClamAV, indicating malicious intent. It contains numerous embedded URLs, with at least one identified as a redirector to malicious infrastructure. The document body, though heavily obfuscated, appears to contain metadata related to guidelines and application versions, suggesting a lure to disguise the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://dafemum.ru/123?utm_term=clostridium+difficile+guidelines+idsa+2018 In PDF document text
    • http://hangookoil.ru/dakuxaza8k3wj.pdfIn PDF document text
    • http://save50.pro/40601658391oc7wy.pdfIn PDF document text
    • https://cdn.sqhk.co/xekejegixawo/K8iiJgh/maps_for_minecraft_pe_minemaps_apk.pdfIn PDF document text
    • http://mastericy-chistoty.ru/beginner_english_lessons_for_adultse9gi4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486521/normal_602f7ab5c4fb9.pdfIn PDF document text
    • http://wezejej.22web.org/cat_meow_sound_audio.pdfIn PDF document text
    • http://ashotik.space/larivipegitosudaku6cb1m.pdfIn PDF document text
    • https://cdn.sqhk.co/rorezina/Diehejj/true_skate_complete_trick_list.pdfIn PDF document text
    • http://normab-id.com/nurgle_blood_bowl_team_namesfwd44.pdfIn PDF document text
    • https://cdn.sqhk.co/ximepadogi/Hhacjfz/ancient_greek_military_formations.pdfIn PDF document text
    • http://phrensy.co/wedaxeliga51ei6.pdfIn PDF document text
    • http://afracheat6.xyz/how_do_you_describe_the_shape_of_a_graph1k0uc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474720/normal_604065b5e483c.pdfIn PDF document text
    • http://winnerslm.space/winning_1x2_betting_tips_apk7owjv.pdfIn PDF document text
    • https://cdn.sqhk.co/limizolaxa/hdbihgi/tyrannosaurus_simulator_3d.pdfIn PDF document text
    • http://sreda.city/29181910554ptjkc.pdfIn PDF document text
    • https://cdn.sqhk.co/bulegumu/hGelUmo/rowote.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://purevaxa.epizy.com/cetoacidosis_diabetica_ada_2017.pdfIn PDF document text
    • https://a5fc3680-5c08-4cda-bd6c-abaa3bdf25bc.filesusr.com/ugd/ea5d7b_926cc93d5abc4f73a00c09805946dca3.pdf?index=trueIn PDF document text
    • https://835a0401-7144-467e-aacc-710587930ffc.filesusr.com/ugd/432cba_d33eb8f99f564e29b4d7bd57cbff863c.pdf?index=trueIn PDF document text
    • http://xevorerokune.epizy.com/21126362374.pdfIn PDF document text
    • https://11f44e1d-c86f-4be6-baa1-90970e7c24f5.filesusr.com/ugd/a298ce_a7d3824be01c44d6a02b41d208e95bc1.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_off0000d512.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD512 5768 bytes
SHA-256: 929e8d52064e0ac053e8bca8ff6a49c72cb24c2dc631b095d663255692aba3ed
font_01_sfnt_off0000e89b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE89B 10344 bytes
SHA-256: 7882ba21e30407e6240bf4cec01c7c75fb28b48b56ae5a4ab58a38eac5d07098

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