Malicious PDF — malware analysis report

Static analysis result for SHA-256 c153171cffd3bafe…

MALICIOUS

PDF

76.9 KB Created: 2021-05-25 13:57:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 58e0eae05e4d45e0bdd89d1adeb82933 SHA-1: 3b824d19d3f1599b030de2a473f796b91ff2463a SHA-256: c153171cffd3bafe7555e111fe3bb25eeab30f3a7eea4bbcdac75af48c9489b9
156 Risk Score

Malware Insights

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

The PDF file contains a heuristic firing indicating it is part of a link farm, directing users to external URLs. One such URL, https://jacksth.ru/strik, is flagged as unknown reputation and is likely used for phishing or malware distribution. ClamAV also detected this file as Pdf.Phishing.Trojan, further supporting its malicious nature. The document body, though heavily obfuscated, contains references to educational material, suggesting a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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 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.
  • 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://jacksth.ru/strik?utm_term=libro+de+formacion+civica+y+etica+3+primaria PDF link annotation
    • https://sakafafemowuva.weebly.com/uploads/1/3/4/6/134694971/fuwida.pdfIn PDF document text
    • https://kuxubujokug.weebly.com/uploads/1/3/0/7/130775750/xetuve_bawiwagez_nogaxegirumuxo_futepazuke.pdfIn PDF document text
    • https://zokutiwako.weebly.com/uploads/1/3/0/8/130873782/jalegogulo.pdfIn PDF document text
    • https://nozezezolakufu.weebly.com/uploads/1/3/2/6/132695232/xibesijeni.pdfIn PDF document text
    • https://vuvuzuvikedatun.weebly.com/uploads/1/3/4/5/134529562/3a88ff333.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://uploads.strikinglycdn.com/files/5078a12a-86bc-4d86-8902-ad4e48b51ea1/kivodulenozunenamojoni.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/401c9e45-867e-4912-9546-f19eef8c9efa/1.1_research_theories_of_management_and_leadership_in_health_and_social_care.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/165d632f-fa53-4355-9b7f-384bebf51d97/wuwusoxek.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4763bbb2-5f0a-49cf-8c96-ae9139700492/map_skills_quiz_4th_grade.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0cc9cdef-9c74-4d51-a0d3-15d8eab6ec9f/phet_interactive_simulations_isotopes_and_atomic_mass_worksheet_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4ae74a30-ba7d-422c-a9d2-a6a953485b64/who_can_replace_a_man_brian_aldiss.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/829d9631-4537-4009-9edc-f0a2e1fc5484/871166680.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ddf7fc19-af23-4cf9-90ce-069ed70b4fbd/nigerajenopunimanis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bdeeb38d-6465-4e01-8f0e-08a2d73dc694/2015_chevy_silverado_owners_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/68a61ecd-1955-4f85-b11a-3aff5b0fca51/wabusesanevufop.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4eb2c9dd-d409-4d5d-9a61-e4967606e07b/what_does_the_dance_term_sickled_feet_mean.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f883505f-43ac-44f2-b64f-b62b67be1437/7140486791.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/458e284e-c8d5-4679-808c-bd679fb062ea/macbeth_act_2_study_questions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2fd51688-0582-4a09-8c47-8b8c7b520f70/how_much_money_is_roy_orbison_jr._worth.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ddde6703-89e6-42f5-a609-a21ad341c0c2/black_mirror_white_christmas_song_list.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e7300b88-f74d-4c6e-953c-b58c948b4c29/panasonic_cordless_phone_canada.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4848e0fe-936b-49c3-a86b-80c068c57f7e/how_do_lock_picking_guns_work.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8bc760e0-883e-492a-8ba9-ae25af2215fb/what_is_the_city_of_omelas_like.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/23c4675e-d686-4554-87e3-2229f5057c77/duxikisusepojojurezegupu.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF0E 5284 bytes
SHA-256: acff6ae8378435ffc0ac7a73ec87f41dd429f06051bff1aab273642237941d26
font_01_sfnt_off0000f0f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0F4 11348 bytes
SHA-256: f743ccb69d6c96ced0a99b50324b617b89e9530a1fa0b703389fd47091f129ae
font_02_sfnt_off000115db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115DB 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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