Malicious PDF — malware analysis report

Static analysis result for SHA-256 c908938e405d0bf3…

MALICIOUS

PDF

72.4 KB Created: 2021-03-19 18:19:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: c0551220bf73986a1b14d0c8e29411ad SHA-1: 811039efe638f4b919c075e52e8cfdc7ae477240 SHA-256: c908938e405d0bf3c893a8d6d12f28c0cd00ea87f83005c8cf1a2affe22e2c94
126 Risk Score

Malware Insights

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

The file was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to disposable hosting and are part of a link farm, suggesting a phishing or malware distribution scheme. The document body, though heavily obfuscated, contains keywords related to downloads and analysis, aligning with the lure of accessing external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://midufefew.ru/award?keyword=distressed+debt+analysis+pdf+download PDF link annotation
    • https://fitokuzigijot.weebly.com/uploads/1/3/4/6/134681543/7004906.pdfIn PDF document text
    • https://cdn.sqhk.co/zasokolof/sSjliji/survival_rate_of_pancreatic_cancer_spread_to_liver.pdfIn PDF document text
    • http://counterman.ru/graco_pack_n_play_fold_up_instructionsq8c34.pdfIn PDF document text
    • http://zevewidojodot.mywebcommunity.org/valagofexanuvika.pdfIn PDF document text
    • https://sovomebidug.weebly.com/uploads/1/3/1/3/131379042/4679259.pdfIn PDF document text
    • https://cdn.sqhk.co/lebudawojafi/LjdEZhb/9617906103.pdfIn PDF document text
    • https://cdn.sqhk.co/xuluriwu/kSnTgiD/functional_programming_simplified_scala.pdfIn PDF document text
    • https://noxomawap.weebly.com/uploads/1/3/5/9/135981563/riroba_gunawedufogefaw.pdfIn PDF document text
    • https://pojixaguwor.weebly.com/uploads/1/3/1/4/131453565/3cb8d09457.pdfIn PDF document text
    • https://cdn.sqhk.co/rorajakura/dhajiVg/auto_parts_store_apple_valley_mn.pdfIn PDF document text
    • http://penafur.scienceontheweb.net/cd40174be_datasheet.pdfIn PDF document text
    • https://zejinimab.weebly.com/uploads/1/3/1/8/131856072/lowilupididatejowes.pdfIn PDF document text
    • http://fineagencyy.com/why_do_my_led_lights_keep_flashing3d5by.pdfIn PDF document text
    • http://sesalon.xyz/rinepoqblra.pdfIn PDF document text
    • http://kittyplay.online/how_to_tell_if_a_hot_water_heater_is_onjwqj9.pdfIn PDF document text
    • http://899themes-demo.ru/advanced_english_grammar_free_downloadnqwxy.pdfIn PDF document text
    • https://cdn.sqhk.co/tononapiwaso/tjiXFgh/the_escapists_2_pocket_breakout_mod_apk.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://a121017b-3fb3-450c-9156-48dd71a9bf80.filesusr.com/ugd/07625c_e4058ee08df843b69e162f8d5f67436a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/1b49cc00-e674-4286-b997-b976be3a8b4c/33315091040.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1762c0a1-0b39-4d55-bd6d-d91fc1b69827/89454741205.pdfIn PDF document text
    • https://18574fdc-dbe8-4f24-a3f7-ab3d6ff540e7.filesusr.com/ugd/d45bfa_2dfdd1492b454727be801059415833e8.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/989d7bbb-7224-4b14-ae1c-8bd6c118af6d/miele_vacuum_cleaner_parts_canada.pdfIn PDF document text
    • http://fojosotum.myartsonline.com/latin_phrases_in_criminal_law.pdfIn PDF document text
    • http://lugenizuridaj.atwebpages.com/classic_books_to_read_to_7_year_olds.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_off0000ddc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDC1 5368 bytes
SHA-256: 6987302aff458b9ca5a7dba054638b1dbc38efef8171527a3eb29719739bccc5
font_01_sfnt_off0000f026.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF026 10500 bytes
SHA-256: b585c5820125ebee7a07fe2c6420649c6ab6f8cf1afda30f8ea551b6379b5750