Malicious PDF — malware analysis report

Static analysis result for SHA-256 6312371fab62ef41…

MALICIOUS

PDF

68.0 KB Created: 2021-03-25 13:46:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: ab0a042312434fb516db726f303076ff SHA-1: 65f467968f2aa192b29489b8bbe8942b958b380c SHA-256: 6312371fab62ef418e96bcc5a4fa1197f6a86a98a5517c267fbc51dcc5a862ce
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The document body, though heavily obfuscated, appears to be a lure related to study guide answers, designed to trick users into visiting these malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://pelibifir.ru/wix?keyword=chapter+4+population+biology+reinforcement+and+study+guide+answers PDF link annotation
    • https://cdn.sqhk.co/vakolitakap/iieNnkE/star_wars_episode_2_cast_corde.pdfIn PDF document text
    • https://cdn.sqhk.co/fujotojaxob/Chjgiig/army_pt_uniform_regulation_2020.pdfIn PDF document text
    • http://dogalijun.scienceontheweb.net/the_arrl_handbook_for_radio_communications_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/dukasavubu/jagghfK/16147441958.pdfIn PDF document text
    • http://labifovejes.mypressonline.com/25185096680.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495065/normal_603b58aa96bdf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386363/normal_5fd6e7544a539.pdfIn PDF document text
    • https://cdn.sqhk.co/tezofugowura/b5tig1b/85294700607.pdfIn PDF document text
    • https://cdn.sqhk.co/lisakopew/hhrNgfh/59525448802.pdfIn PDF document text
    • http://felesatediz.medianewsonline.com/embroidery_stitches_patterns.pdfIn PDF document text
    • http://belkwigs.com/bescherelle_vocabulaire_espagnoliic5i.pdfIn PDF document text
    • http://cherrypimp.online/sisafoxonapesalotdvuh0.pdfIn PDF document text
    • http://shoop-fg.ru/download_andy_android_emulator_32_bits0vbz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391605/normal_602bf8bab865f.pdfIn PDF document text
    • http://gevenukodujojov.getenjoyment.net/xoralemumujuzebefofa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sutexuvidag.myartsonline.com/how_to_find_the_wps_pin_on_my_dell_printer.pdfIn PDF document text
    • https://s3.amazonaws.com/tezofuretejom/my_talking_tom_cat_game_free.pdfIn PDF document text
    • https://s3.amazonaws.com/lazolu/youth_baseball_glove_size_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/xedewofuretujo/74961918686.pdfIn PDF document text
    • http://wesatume.atwebpages.com/pensum_ingenieria_civil_uasd.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_off0000c941.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC941 5896 bytes
SHA-256: 84061efb7e34a574942966ee8e59cf7c5fa0dd585458926ec7f152ae3bcff4c7
font_01_sfnt_off0000dd3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD3F 10916 bytes
SHA-256: 5c7746b506120175e970c769e46c4fe1224a056e0721064d4b79b6106b09e09e

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