Malicious PDF — malware analysis report

Static analysis result for SHA-256 73d27ab5c5919cb9…

MALICIOUS

PDF

71.4 KB Created: 2021-03-12 11:43:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 5f016dd0549ce359c3bd838e3a915224 SHA-1: 073ef99d6500e85f19fe5891f9822e56e3799593 SHA-256: 73d27ab5c5919cb9ccd04b32891e4d7a1ed19f29380ec92fdf1ae9143ff7662c
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with at least one identified as a malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool often used to create malicious PDFs that mimic legitimate documents to trick users into clicking links.

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
  • 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/award?keyword=mathematics+research+project+pdf In PDF document text
    • https://cdn.sqhk.co/buzaxelubot/6Lhfgjp/handheld_spiralizer_target.pdfIn PDF document text
    • http://accueilcmb.com/509853756297nhpw.pdfIn PDF document text
    • http://dreabling.online/ultimate_fishing_simulator_guide_android76ii8.pdfIn PDF document text
    • http://superheatbelt.xyz/73285631652c47he.pdfIn PDF document text
    • https://cdn.sqhk.co/zudilubal/ghheYic/mavixeg.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467589/normal_6045b887bded7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384459/normal_5fd314023791f.pdfIn PDF document text
    • https://cdn.sqhk.co/zebimapajod/yifxjbB/71744402935.pdfIn PDF document text
    • http://thedefenseforge.com/pafavunorafobovabalenofukn6x5u.pdfIn PDF document text
    • https://cdn.sqhk.co/migukosodaza/zibijBE/36758913686.pdfIn PDF document text
    • http://sarhello.online/grinold_and_kahngc7wq.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446162/normal_6004788bc089f.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/bokofapig/murufefelodelisigoveker.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/93cafbe7-bc73-417d-a020-eb4feadb3b08/68169043221.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1d69a6c5-98e4-4927-b084-111d9717730a/63464221111.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8855b8c4-ca7b-4bcc-baf5-2377d6730995/is_pastafarianism_a_real_religion.pdfIn PDF document text
    • https://s3.amazonaws.com/kefefetafij/alex_rider_stormbreaker_book.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/084e920a-8564-474e-bbbd-4de189fa34de/hot_briquetted_iron_hbi_production_plant_in_india.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5e32c25a-c521-4a0f-9dc4-931e75cfd1d5/danotoxugof.pdfIn PDF document text
    • https://s3.amazonaws.com/busutafitufe/assamese_new_video_song_2019_asomi._in.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_off0000d8f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8F6 5444 bytes
SHA-256: 232897146a8fb55a6b74e9743aaf833b1413a86d92ca36660ecf81c9e93a4654
font_01_sfnt_off0000eb63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB63 11056 bytes
SHA-256: e0b92cd6e07fc77132a8890aac3f003e181bd136199eea142f4367e849e3a9d9

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