Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9f83e344c8cebb5…

MALICIOUS

PDF

84.6 KB Created: 2021-05-14 17:09:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: fc6029c439a1a21c7f81287c9133c057 SHA-1: e992db855451d57dc6efdb904ca40f2fe4e91cc7 SHA-256: c9f83e344c8cebb55cf3cd94f08b9729ba23af6dccaffaddbb695ee4d447ad54
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a critical heuristic identifying it as a link farm hosted on disposable domains. One of the primary URLs, 'https://nipisod.ru/strik?utm_term=how+to+scan+using+epson+xp+245', appears to be a lure for phishing or malware. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://nipisod.ru/strik?utm_term=how+to+scan+using+epson+xp+245 PDF link annotation
    • http://wurilozi.scienceontheweb.net/spells_in_half_blood_prince.pdfIn PDF document text
    • http://peramabejakes.sportsontheweb.net/converting_kindle_content_to.pdfIn PDF document text
    • http://tiwimifozukimu.medianewsonline.com/what_to_say_when_making_amends_aa.pdfIn PDF document text
    • http://gixapedotamerow.mywebcommunity.org/microsoft_office_365_quick_reference_guide.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://9c43cb74-45e3-47de-9527-fda2e8336169.filesusr.com/ugd/af0aa9_2a01cd9dc46443b3bdb5e6fa03a7770b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c11a3f11-ed6f-4622-b7e3-a02ca95c94bf/oracle_12c_client_64_bit_installation.pdfIn PDF document text
    • https://91ca87c2-c493-4616-adaa-fbcec45394e1.filesusr.com/ugd/6116da_d5f3fd172f0e47d5a383662df03f1fbb.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/1fff963f-4b32-4952-915c-778a3930df59/zidadatepid.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d760c8d0-e0b7-40a6-8e77-1fc9f14ca69d/aiag_ppap_booklet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/118cb793-18d0-4137-848b-45fdec4ab069/speed_queen_washer_and_dryer_dimensions.pdfIn PDF document text
    • https://6c036dbd-b327-4678-b778-de8a2ee7bb50.filesusr.com/ugd/ed64d2_4067a555a1d545d7a008553ad87d3acd.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a2fb23d8-c97b-4335-9ec8-a2f791ec0161/jibowi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/35a94c5e-987d-495b-a0a4-82b8be814d21/join_dd_campaign_online.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/65fe0ded-8506-41ca-ac3b-e6346c955a27/disgraced_ayad_akhtar_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/555f1ba6-eef2-420b-8ad5-20f4598b3aa4/xivipugitu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a02f7530-fab5-4ca2-a44b-938028eb61d3/how_to_fix_bosch_washing_machine_door_handle.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bb115e93-ce7c-488c-9290-9188e4e0e838/gavuwunibajumikir.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a280ab28-45e4-4b12-9d3c-7b5b0ab277ec/4th_grade_math_games_free_online.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6e6b9c1e-b4de-4960-abc7-cd6526a0fa69/how_to_work_harbor_breeze_remote.pdfIn PDF document text
    • https://7a579b3f-ce96-4c66-abdc-991530493d29.filesusr.com/ugd/010c6b_8906ae099a7849c1b3d8095f733ec337.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e768.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE768 5320 bytes
SHA-256: a0959c1806ddff2295bfc96693275a472c9f786b89490151fee33a1610609258
font_01_sfnt_off0000f9b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9B5 11316 bytes
SHA-256: 6d8203ebd5c90c4fdfa5a6088abc9a75f47ff0cdbbd121442e8a6c25aa4ac5c9
font_02_sfnt_off0001208f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1208F 16392 bytes
SHA-256: c9b9d40238817e9fd1c0b290bb100284b8f2d9dcc1188338581b9d27efa8fa30
font_03_sfnt_off0001363a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1363A 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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