Malicious PDF — malware analysis report

Static analysis result for SHA-256 805dd48f25a9c383…

MALICIOUS

PDF

86.4 KB Created: 2021-04-03 05:44:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 5068a74d40972bf2b9f3400e73c71b3a SHA-1: 7e9ca32fc5ed23cb01810c1b0151076ac0794fe0 SHA-256: 805dd48f25a9c3838385a8ae9e0511fb96546e246ea55bc2bd933c9c317984ee
126 Risk Score

Malware Insights

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

The PDF document contains multiple embedded URLs, many of which point to disposable hosting services and are flagged as part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The document body, though heavily obfuscated, suggests a lure related to credit risk analysis, aiming to trick users into visiting these external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://baarspo.ru/award?keyword=an%25C3%25A1lise+de+risco+de+cr%25C3%25A9dito+pdf PDF link annotation
    • https://dufelawukada.weebly.com/uploads/1/3/2/6/132682042/bumujugepased.pdfIn PDF document text
    • https://mafinejolid.weebly.com/uploads/1/3/2/6/132683008/jijizivibuji.pdfIn PDF document text
    • http://kindraretterath.com/pippin_broadway_scriptk8zm2.pdfIn PDF document text
    • http://driveformclanemilwaukee.com/lagu_blood_money_jon_bon_jovisd1kl.pdfIn PDF document text
    • http://ig-copyrightnoticehelp.com/3333078717u9q9x.pdfIn PDF document text
    • http://delayikapy.xyz/the_last_house_on_the_left_1972_soundtrack205i2.pdfIn PDF document text
    • http://carins.info/dutavodubuvuk2tv45.pdfIn PDF document text
    • http://trujillostacoshop.com/story_robert_mckeef8qaf.pdfIn PDF document text
    • http://nalatakojuzali.iblogger.org/powerpoint_themes_free_2013.pdfIn PDF document text
    • http://legrand-spb.ru/vore_visual_novel2tsgt.pdfIn PDF document text
    • http://copyrightnotices-form.com/mmpi-2-_interpretation_validity_scales5m8p2.pdfIn PDF document text
    • http://fupotofisati.iblogger.org/nesegejerogubuloxupik.pdfIn PDF document text
    • http://b0xberry.online/alexander_the_great_age_and_manner_of_deathtnomd.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tozemuj.rf.gd/motowuridaboxex.pdfIn PDF document text
    • http://nazozogev.epizy.com/gutimofunirowexoragugudur.pdfIn PDF document text
    • http://sibalunamiwiner.epizy.com/classification_of_antibiotics_based_on_mode_of_action_ppt.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_off00011040.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11040 5304 bytes
SHA-256: 264eb44019a276299a552d41bd2c7adb6a2d9f3a401b1dd41f9c6e93e968d978
font_01_sfnt_off0001220f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1220F 13608 bytes
SHA-256: b4d7dd51fe8a7b05b04e5725fa5916726d5f66eeb879718bc25c8b0d7b55dfc1

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