Malicious PDF — malware analysis report

Static analysis result for SHA-256 388cb1ef317c1e03…

MALICIOUS

PDF

78.5 KB Created: 2021-04-04 13:48:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: d0dbb9eb942a1ebc2ad63f6e06ac2895 SHA-1: 2187f7cb5833b727d6179c3baaab19866a1ce1ce SHA-256: 388cb1ef317c1e036c86551684f8e5e56576dc9318ab9c2c20bbb64ef0fe5732
126 Risk Score

Malware Insights

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

The file is a PDF containing an embedded URL that points to a suspicious domain, flagged by heuristics as a link farm on disposable hosting and detected by ClamAV as a phishing trojan. The ML classifier also strongly indicated maliciousness. The PDF's content, though heavily obfuscated, appears to be a lure related to a game guide, aiming to trick users into visiting the malicious URL.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://jumiwimov.ru/123?utm_term=disciples+3+renaissance+guide PDF link annotation
    • http://gobalesevusob.iblogger.org/35618298512.pdfIn PDF document text
    • http://boxoxele.22web.org/foposibidiposajiva.pdfIn PDF document text
    • http://suxulopiluv.22web.org/botany_notes_for_bsc_2nd_year.pdfIn PDF document text
    • http://towufato.mywebcommunity.org/cirque_du_freak_darren_shan_summary.pdfIn PDF document text
    • http://natotakujoriw.iblogger.org/ardaas_karaan_movie_full.pdfIn PDF document text
    • http://ladujose.sportsontheweb.net/robin_hood_2018_movie_actress_name.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/3f950433-245b-40c9-9cd8-4e4e859c2ef0/malewejenaxo.pdfIn PDF document text
    • http://pikugire.epizy.com/33016814681.pdfIn PDF document text
    • https://77abcf6a-1f47-4233-a5f7-28832101be0a.filesusr.com/ugd/e29e5c_7cd7c17bd1d149169c2c0e590db058d8.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sefabe/canada_immigration_points_calculator.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/256139fa-4a4d-45e2-ba32-83d77cd6f07d/is_swing_trading_easy.pdfIn PDF document text
    • https://85d2c5a2-fc31-4f76-86b4-4ebe2abe2bf4.filesusr.com/ugd/a8cc01_80ba40aefc6f426986952b00f29ad1e8.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/efd89c8f-deca-4959-95b5-8fea0f181b1f/english_speaking_learning_app_for_pc.pdfIn PDF document text
    • https://70010cfe-69b1-4fe9-a336-bdfe2418dc1e.filesusr.com/ugd/f1d680_d1b4d72563ca408e9e7285a309fbc9df.pdf?index=trueIn PDF document text
    • https://311919ef-92bb-434b-a93e-382c1a5e2e65.filesusr.com/ugd/c893b4_5746e5a2a60c41d792f592e49a05ee6d.pdf?index=trueIn PDF document text
    • http://sofidusujewa.epizy.com/15415943218.pdfIn PDF document text
    • https://989244f3-426d-4557-b4f1-0018dac9047c.filesusr.com/ugd/57c819_3fcb2455c92049fda3db1617f297aa81.pdf?index=trueIn PDF document text
    • http://tulifal.onlinewebshop.net/11144750035.pdfIn PDF document text
    • https://s3.amazonaws.com/tezude/which_string_trimmer_is_best.pdfIn PDF document text
    • http://felepav.epizy.com/dslr_video_shooter_gh5_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/wovugi/what_size_tires_are_on_a_2005_chevy_malibu.pdfIn PDF document text
    • https://s3.amazonaws.com/banula/gadudonuji.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_off0000f35c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF35C 5404 bytes
SHA-256: 0708b24f99b3b053df14cf689f8ac637cc0c36e68fd50956648d89ba22d44980
font_01_sfnt_off000105cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105CC 11608 bytes
SHA-256: 915a254111497a0845d107c992c12ac759808501106d5617c96ef97bd6df0816

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