Malicious PDF — malware analysis report

Static analysis result for SHA-256 51734c5fea77da4e…

MALICIOUS

PDF

75.7 KB Created: 2021-06-03 02:46:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 399e130b31311fa0ccea2cb82f239e56 SHA-1: a81c3acc1713609cf2e2503f970cc4e3e98579cc SHA-256: 51734c5fea77da4e7c79e818c1ef0550ce8d97d754244b4b5332c8d60257494f
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 hosted on disposable domains, indicating it functions as a link farm. This is further supported by heuristics identifying it as a 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM'. The presence of ClamAV detection and an ML classifier flagging it as malicious reinforces its suspicious nature, likely intended for phishing or distributing further malware. No scripts were extracted, but the structure strongly suggests a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://bologen.ru/123?utm_term=anna+movie+telugu+songs+free PDF link annotation
    • https://fenivubad.weebly.com/uploads/1/3/4/4/134482284/a35569f9177dc.pdfIn PDF document text
    • https://datafixujur.weebly.com/uploads/1/3/7/5/137516556/noreje.pdfIn PDF document text
    • https://wavopotajulaja.weebly.com/uploads/1/3/4/6/134631105/6741750.pdfIn PDF document text
    • https://virerulifig.weebly.com/uploads/1/3/1/4/131407283/5954364.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457582/normal_6044e0012e1e5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415327/normal_606360c5cbfe0.pdfIn PDF document text
    • https://minaraxu.weebly.com/uploads/1/3/4/7/134765114/wimurerepiv_podipex_kisunejipozit.pdfIn PDF document text
    • https://bufogepuvuzi.weebly.com/uploads/1/3/1/3/131381066/2835054.pdfIn PDF document text
    • https://mujiborabasovu.weebly.com/uploads/1/3/4/5/134590634/tunureza.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381766/normal_5fff40d3b7a03.pdfIn PDF document text
    • https://kukefilatisila.weebly.com/uploads/1/3/4/4/134498126/9812455.pdfIn PDF document text
    • https://fonamajubeb.weebly.com/uploads/1/3/4/4/134474676/saretowej-jerovejovomoxev.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dajodovilav.pbworks.com/w/file/fetch/144534294/86145248637.pdfIn PDF document text
    • http://banusiv.pbworks.com/w/file/fetch/144441612/how_to_tell_the_difference_between_monocots_and_dicots.pdfIn PDF document text
    • http://gediripu.pbworks.com/f/mini_international_neuropsychiatric_interview_kid.pdfIn PDF document text
    • http://kelivesas.pbworks.com/f/android_mods_stardew_valley.pdfIn PDF document text
    • http://nilanom.pbworks.com/f/65864740038.pdfIn PDF document text
    • http://fevawigo.pbworks.com/f/plantronics_bluetooth_headset_pair_with_iphone.pdfIn PDF document text
    • http://kinuwibe.pbworks.com/w/file/fetch/144444360/occupational_therapy_discharge_note_example.pdfIn PDF document text
    • http://lulimogosan.pbworks.com/w/file/fetch/144492582/the_legend_of_zelda_the_minish_cap_nintendo_game_boy_advance_rom.pdfIn PDF document text
    • http://wikoborumun.pbworks.com/w/file/fetch/144493164/torres_patient_care_in_imaging_technology_9th_edition.pdfIn PDF document text
    • http://vajaxasave.pbworks.com/w/file/fetch/144452823/what_is_the_difference_between_administration_and_human_resource_management.pdfIn PDF document text
    • http://jajisaparev.pbworks.com/w/file/fetch/144418479/rukakunisoz.pdfIn PDF document text
    • http://lijegazoz.pbworks.com/w/file/fetch/144414645/spirit_bear_book.pdfIn PDF document text
    • http://gatasulupu.pbworks.com/w/file/fetch/144411927/google_scholar_profile_criticism.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_off0000ea3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA3B 5136 bytes
SHA-256: adff9d4398c687fb7303ae78077f595d6bc633f3039e9d7bc4d21b25cc7d002c
font_01_sfnt_off0000fba8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBA8 11168 bytes
SHA-256: 3501eb2ebe5a13ee132a7429c146707155038e5966a7c03a0bc8a9e39a8110a2

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