Malicious PDF — malware analysis report

Static analysis result for SHA-256 96538bff5327ab99…

MALICIOUS

PDF

99.9 KB Created: 2021-06-06 18:54:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 2dc5398825d74d06aa32415841ccbed1 SHA-1: 20c3f863399ea309d5ed1e13b40702af13012a55 SHA-256: 96538bff5327ab998507c204a2c7bf0ab5e6491db90bebb12967064585520716
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable hosting services, suggesting a link farm or phishing lure. The primary URL, https://xajibur.ru/123?utm_term=bipap+mode+pdf, is likely part of a phishing campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://xajibur.ru/123?utm_term=bipap+mode+pdf PDF link annotation
    • https://tenimevu.weebly.com/uploads/1/3/4/3/134315692/boxorijewipe_pokubotovawirof.pdfIn PDF document text
    • https://wexarasi.weebly.com/uploads/1/3/4/3/134351888/19d98ddb.pdfIn PDF document text
    • https://pezazexumazu.weebly.com/uploads/1/3/5/3/135392870/9827992.pdfIn PDF document text
    • https://fofifiso.weebly.com/uploads/1/3/4/6/134613093/fibisevaf-riwofol.pdfIn PDF document text
    • https://fafevidelaxikez.weebly.com/uploads/1/3/4/4/134481631/wepapopopi.pdfIn PDF document text
    • https://pivatebovuwize.weebly.com/uploads/1/3/0/7/130775292/569aaa.pdfIn PDF document text
    • https://nifabixiguwo.weebly.com/uploads/1/3/5/2/135295020/kuxubenetuwo.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
    • http://nagomax.pbworks.com/f/ea_sports_ufc_3_pc_download__full_version_crack.pdfIn PDF document text
    • http://dipoziw.pbworks.com/w/file/fetch/144439824/how_to_turn_a_convertible_crib_into_a_toddler_bed.pdfIn PDF document text
    • http://zupelapowi.pbworks.com/w/file/fetch/144499455/a_grain_of_wheat_summary_and_analysis.pdfIn PDF document text
    • http://jiboduxoguv.pbworks.com/f/human_physiology_from_cells_to_systems_9th_edition_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3f91c8a5-a338-4549-85ce-c180adb45864/42227524146.pdfIn PDF document text
    • http://xobapotowi.pbworks.com/f/what_is_the_meaning_of_actions_speak_louder_than_words_in_malayalam.pdfIn PDF document text
    • http://fudejob.pbworks.com/f/58584985773.pdfIn PDF document text
    • http://memofemovo.pbworks.com/w/file/fetch/144618642/what_intermolecular_forces_does_nitrogen_tribromide_have.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/53ffa758-e261-481e-bd9e-d632c5416597/is_admission_list_out_for_uniben.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0cde6eb6-5d26-4078-9451-cf3a801c755e/xogokidixugowudifiporeni.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7fbb7f0c-17ef-4ef0-be9c-59a263f774ab/are_acorn_stairlifts_any_good.pdfIn PDF document text
    • http://sujagajo.pbworks.com/w/file/fetch/144556164/nrega_job_card_application_form_in_marathi.pdfIn PDF document text
    • http://vulazojab.pbworks.com/f/60037699724.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/271435d0-5e46-4f9f-b6a8-5b6bc78201dd/7143184249.pdfIn PDF document text
    • http://dawijunegolo.pbworks.com/w/file/fetch/144611379/12377843479.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_off00013d13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D13 4532 bytes
SHA-256: d85943292f293d27c32c0505979f934d3cd67ab4ba70dd7783328a1fb271d438
font_01_sfnt_off00014c78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C78 12084 bytes
SHA-256: cb30e17e8a5c3bd8852d7b0eb7d20c51c9b58978247c952a3925f40fa883f580
font_02_sfnt_off00017490.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17490 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3