Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad36ac2b67f9e75a…

MALICIOUS

PDF

79.2 KB Created: 2021-04-19 14:09:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 33affc9d1dd446c4a96f7888054f343d SHA-1: 5111030742ee233b2e77197f79e59cf489d1a485 SHA-256: ad36ac2b67f9e75ab119e2215fdf46ed25e1d1d3bcad56ccf5a134c001e023e1
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, and one specific URL is flagged as malicious. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The document body, though heavily obfuscated, contains text related to typing speed, which may be a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://baarspo.ru/strik?utm_term=is+typing+100+wpm+good PDF link annotation
    • http://tevajevidiwa.22web.org/understanding_balance_of_payments.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407304/normal_5fe4ddc52c117.pdfIn PDF document text
    • http://watomadoxaxa.iblogger.org/27870952009.pdfIn PDF document text
    • http://fovejawurolugaf.iblogger.org/free_workout_videos_like_p90x.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381730/normal_6032202d37e13.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386591/normal_60353227acf4f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://muzudamufuvase.rf.gd/portugues_espaol_diccionario.pdfIn PDF document text
    • http://bofidimasep.rf.gd/fevijumatalifodebizevarej.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b925907e-2900-449f-8901-8805968a3c5e/89431826846.pdfIn PDF document text
    • http://timodetunidup.epizy.com/carpenters_greatest_hits_album_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bb66a3ba-3648-4dea-9df3-f04ddf5c4df3/is_25_a_milestone.pdfIn PDF document text
    • http://dobusimosekaba.epizy.com/42182762150.pdfIn PDF document text
    • https://e5acd528-9925-4355-98ed-6c6122c9c19a.filesusr.com/ugd/49fecd_6feeda1b09ac43aa96558707984b99a5.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/588c6d3e-042b-4691-b819-e88d8567a4e6/refurebegugerijazudabirez.pdfIn PDF document text
    • http://xosareregaka.epizy.com/melefekajaxexegowemovud.pdfIn PDF document text
    • https://2061f665-9309-41a6-981d-137229ee7e60.filesusr.com/ugd/eb2fe6_11b0be5d83604852abc10eda3c9ee0ca.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bezegoluzose/agriculture_tools_information_in_english.pdfIn PDF document text
    • http://mujozitovisiwud.rf.gd/nccn_guidelines_for_patients_acute_lymphoblastic_leukemia.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a9aa2266-87fe-4bd6-8ec7-cce3334314f0/what_i_know_for_sure_audiobook.pdfIn PDF document text
    • http://waxozex.epizy.com/anticipatory_set.pdfIn PDF document text
    • https://s3.amazonaws.com/jixeremipet/19728399378.pdfIn PDF document text
    • https://s3.amazonaws.com/lorifumofelu/game_brawl_stars_hack.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c671cb1d-237c-48cf-90ea-07dec0d6c9f6/who_is_the_bravest_character_in_macbeth.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_off0000f763.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF763 5264 bytes
SHA-256: 69e701e9981d8f9e44abc78c97bafc0931d72349857180a1904a19015f923c02
font_01_sfnt_off00010963.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10963 11280 bytes
SHA-256: 747a3561d21569be9f4dba0ca4228c459d2d6d632f6137b78518a9283fac23de

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