Malicious PDF — malware analysis report

Static analysis result for SHA-256 242fe890ba3fb836…

MALICIOUS

PDF

74.9 KB Created: 2021-05-10 11:06:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 05ce7175b35073bf9535ba22c353ae5e SHA-1: 09bdd16c949e5cd3cfcf5e12167d2b793aef7cca SHA-256: 242fe890ba3fb8365e540988b27ac34a169c979f4a95498c36ff0dfa08178707
126 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous embedded URLs, many pointing to disposable hosting, suggesting a link farm designed to redirect users to malicious content. The document body, though heavily obfuscated, contains metadata related to 'how to learn chinese for free', likely a lure to disguise the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://seumenha.ru/wb?keyword=how%20to%20learn%20chinese%20for%20free PDF link annotation
    • http://naturalik.fun/math_puzzles_for_4th_grade_printablesmnyt8.pdfIn PDF document text
    • http://vizezokope.iblogger.org/types_of_text_structure_7th_grade.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412758/normal_6014e9ae8cf9d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484610/normal_5fc659b2cea56.pdfIn PDF document text
    • http://rigoditibalun.mywebcommunity.org/building_construction_1_download.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366388/normal_5fee74990f773.pdfIn PDF document text
    • http://waliduv.mypressonline.com/hernia_abdominal_incisional.pdfIn PDF document text
    • http://weraka.online/terazodd86kp.pdfIn PDF document text
    • http://triple-doska1.club/resazaxanizapokitozdetvh.pdfIn PDF document text
    • http://vizenam.medianewsonline.com/dusir.pdfIn PDF document text
    • http://instapriz.site/seal_lullaby_piano_sheet_music_freetbjwb.pdfIn PDF document text
    • http://nanonewe.scienceontheweb.net/business_writing_exercises.pdfIn PDF document text
    • http://bionatur.space/2734407095kad4b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390663/normal_603af26dbd355.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://petojijoxura.onlinewebshop.net/54744820124.pdfIn PDF document text
    • https://d56a38bf-d62e-453c-9b5b-5b2fe88aea46.filesusr.com/ugd/359e64_8fd25231523147528ed69afd0b826de6.pdf?index=trueIn PDF document text
    • https://396694ba-7169-44b6-a088-eebc9ce0ffb7.filesusr.com/ugd/99b222_72f9f888497847bba26543b39594528b.pdf?index=trueIn PDF document text
    • https://85ed388a-52e0-4e79-9737-9d4b769dda71.filesusr.com/ugd/bb10c5_d4d68665c2b443a0ab3f4487a737b023.pdf?index=trueIn PDF document text
    • http://lelikerakovet.atwebpages.com/difference_between_bioaccumulation_and_biomagnification.pdfIn PDF document text
    • http://mudefikireneb.rf.gd/xemurelarikise.pdfIn PDF document text
    • https://3857ddc0-2b33-46ba-b4a8-ebef9b167687.filesusr.com/ugd/5cc0d5_8c2231083c1346ccb8b90ea5aead2ae8.pdf?index=trueIn 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_off0000e700.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE700 5024 bytes
SHA-256: ef8648e4ca026f1b858f1dcbbae8eb1145c0c456600d74ea6c87571d48e6abbf
font_01_sfnt_off0000f81d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF81D 11336 bytes
SHA-256: 1aef73c80b3ce25ad4ccfbe218cfa9639c5d00890430cc9967e795833a8afac6

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