Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac812fbf892c99f5…

MALICIOUS

PDF

72.7 KB Created: 2021-03-29 18:48:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 320626d8a3319f916004853bc7f513e9 SHA-1: de6a8b0364e61e9c4cbb552e58fc2e8c8c8d550b SHA-256: ac812fbf892c99f51848d326bacfe74e75fbfb86b6691d875b4f991ee0a01cfe
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or SEO manipulation tactic. The ML classifier and ClamAV detection strongly indicate malicious intent, with ClamAV identifying it as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and heuristics point towards malicious content delivery or redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://jacksth.ru/award?keyword=autoimmunity+nptel+pdf
    • https://cdn.sqhk.co/vujixete/jarodgg/bts_dynamite_official_mv_lyrics.pdf
    • https://pemolopudamas.weebly.com/uploads/1/3/4/7/134753943/vilop.pdf
    • http://falisekivi.iblogger.org/harry_potter_and_the_half_blood_prince_video_game_ps4.pdf
    • https://cdn.sqhk.co/zetoreli/agfjejf/atoz_word_finder_scrabble_dictionary.pdf
    • http://dixojele.22web.org/fewesusati.pdf
    • https://jutoxanifi.weebly.com/uploads/1/3/5/3/135321179/jewimomax-rikuwolaluzav-zixuduboxuzolug.pdf
    • https://cdn.sqhk.co/turanexode/igPY0YQ/50405506211.pdf
    • https://kimuremosov.weebly.com/uploads/1/3/4/7/134732255/3162632.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/tikoweravisixu/is_bc_short_for_because.pdf
    • https://s3.amazonaws.com/kezemiradigu/how_to_fix_charging_port_samsung_tablet.pdf
    • https://uploads.strikinglycdn.com/files/ca2ead9b-3965-4012-97ba-5e42d20321b9/fluval_305_filter_set_up.pdf
    • http://fopadunopim.epizy.com/sevesinorizixesiseb.pdf
    • https://uploads.strikinglycdn.com/files/78f00689-226b-4da9-b007-32a8fc6ca6a0/como_hacer_una_linea_del_tiempo_para_nios_de_preescolar.pdf
    • https://uploads.strikinglycdn.com/files/96559d49-c207-4ec1-8e52-751ad624ade5/84271751249.pdf
    • https://uploads.strikinglycdn.com/files/fe282b4f-a0f9-4045-a636-8ee78650a71a/tugij.pdf
    • http://muxibiw.epizy.com/daddy_fell_into_the_pond_poem_explanation.pdf
    • https://s3.amazonaws.com/bulozor/nilareditej.pdf
    • https://uploads.strikinglycdn.com/files/7edec7a3-fb41-4493-add8-3ea4a56f78e9/krups_ice_cream_maker_parts.pdf
    • https://s3.amazonaws.com/vebogotexaf/dictionary_for_android_phone.pdf
    • https://uploads.strikinglycdn.com/files/78399fca-06e5-40dc-be0f-406572a6af29/will_it_be_another_twilight_movie.pdf
    • http://muriporufulov.epizy.com/basics_of_python_programming_language.pdf
    • https://s3.amazonaws.com/zagapaxa/bogerebapafipadokolupu.pdf
    • https://uploads.strikinglycdn.com/files/53425402-9bfb-4a93-bf19-d4d87f80e636/yaesu_ft-450d_best_price.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e16c.bin
9c4a625b4cf2164f83a8e0b84fadc8d4038a616ac685bf7f0bc47d9e5bed4942		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE16C 4796 bytes
font_01_sfnt_off0000f1bf.bin
afb9faddcb659a81d58c5c25a9f6681d9b1893f84430c75914fba61cfa217c11		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF1BF 10432 bytes

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