Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8bedb13e38072e8…

MALICIOUS

PDF

88.1 KB Created: 2021-03-14 15:15:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7f86c8c4c1d0b8ff53decab8b6eff52c SHA-1: 9d25c37e4ace920b9503f6fa717c2c9d2d1e7ba5 SHA-256: f8bedb13e38072e8b686226fe761fd3bc3a88a492a25547065fa1af47a639b0f
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to PDF files hosted on suspicious domains, indicating a link farm or SEO poisoning attack. ClamAV and ML heuristics confirm the malicious nature, identifying it as a phishing trojan. The embedded URLs suggest an attempt to redirect users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/wix?keyword=level+g+unit+3+vocab+answers
    • http://xtreme-sport.ru/50269370166o204e.pdf
    • http://ita-bio.fun/metal_gear_solid_5_phantom_pain_ps4_review1bigk.pdf
    • http://rumigiwataj.getenjoyment.net/how_to_descale_a_cuisinart_keurig_coffee_maker.pdf
    • http://probkin34.xyz/rainbow_fish_aquarium_and_pet_shop_jabalpur_madhya_pradeshmk34i.pdf
    • https://rokaxitifefisol.weebly.com/uploads/1/3/4/0/134040577/figosivo_vinogitu.pdf
    • https://moxipilewuzeget.weebly.com/uploads/1/3/4/3/134360433/77538e4681b6.pdf
    • http://copyrightshelpscenters.com/583449480013dpmk.pdf
    • http://zibepifutidi.sportsontheweb.net/how_often_to_change_your_electric_toothbrush_head.pdf
    • https://fuxuvaxekanu.weebly.com/uploads/1/3/4/6/134648937/6c2abd3b4f.pdf
    • http://rilomenininun.getenjoyment.net/gandhian_concept_of_rural_development.pdf
    • https://wudegilunukoga.weebly.com/uploads/1/3/1/3/131379548/3621939.pdf
    • https://sorezoxawo.weebly.com/uploads/1/3/2/7/132712551/e7ab85ec4.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://c01188fd-d8af-4b86-846b-090f7ecd58d8.filesusr.com/ugd/9058e5_356c6ec48b0d4112abaa56d2c4fb18d2.pdf?index=true
    • https://s3.amazonaws.com/mudurixo/why_wont_my_canon_mg3600_print.pdf
    • https://s3.amazonaws.com/vedexajawo/car_bill_of_sale_florida.pdf
    • https://s3.amazonaws.com/wifukedot/cheap_thrills_full_song_audio.pdf
    • https://ef2e072a-e8a2-4438-804d-cc750be2e2f6.filesusr.com/ugd/6a22cb_5d55d731bb244016a15197cd893c6c05.pdf?index=true
    • https://s3.amazonaws.com/wikurixobelu/xodax.pdf
    • https://s3.amazonaws.com/polojuliragam/que_sintomas_se_tienen_en_la_primera_semana_de_embarazo.pdf
    • https://cb2d4818-2134-4ea5-ae57-1bc45cfc4292.filesusr.com/ugd/7e787c_4aa3a45e32044bc6848a3933b112b067.pdf?index=true
    • https://s3.amazonaws.com/sixenogafopoj/cultivo_de_caigua.pdf
    • https://s3.amazonaws.com/wegugus/hewlett_packard_33120a_datasheet.pdf
    • https://645c32c3-7e99-4959-b93b-7980205539d7.filesusr.com/ugd/30a31c_4e929c0978e740108c8607bf9af49eb5.pdf?index=true
    • https://s3.amazonaws.com/muxegeza/bose_wave_radio_cd_player_not_playable.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010822.bin
279a75dbc99637b2aabc37b9e4512aa50544f1c52e572e05f1825e11ad020ff8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10822 5244 bytes
font_01_sfnt_off00011a1e.bin
9bc1b63febbec818eaa2ae89eb9df7634a07857401632e791f551897dc2ef543		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11A1E 13620 bytes
font_02_sfnt_off000144d5.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0x144D5 4324 bytes

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