Malicious PDF — malware analysis report

Static analysis result for SHA-256 361c53d07c07841a…

MALICIOUS

PDF

76.9 KB Created: 2021-02-22 19:08:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 04536f602618196d845b515b276bebe9 SHA-1: 907b1f25011aad89ba09c3d43b63574fa557c891 SHA-256: 361c53d07c07841a38168965d20d54e66d3f25a2f060515e63e6137ebcfa48be
126 Risk Score

Malware Insights

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

The file is a PDF containing numerous embedded URLs, many of which point to disposable domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The presence of a URL with a 'walking dead comic' query parameter suggests a lure to entice users to click.

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://maypoin.ru/123?utm_term=walking+dead+comic+issue+100 PDF link annotation
    • http://gozipoxeget.iblogger.org/alphabetize_google_sheets_tabs.pdfIn PDF document text
    • https://gevumonalibi.weebly.com/uploads/1/3/1/1/131164272/529d8.pdfIn PDF document text
    • http://ubzvp.com/computer_system_validation_courses_in_mumbaivxgo8.pdfIn PDF document text
    • http://ideal-it.fun/80159506716wpyuj.pdfIn PDF document text
    • https://wanevowak.weebly.com/uploads/1/3/4/4/134465130/8887499.pdfIn PDF document text
    • http://pravagims.net/website_design_samples_free0ohrf.pdfIn PDF document text
    • http://dekagexagupeje.iblogger.org/kikogikobaloba.pdfIn PDF document text
    • https://donikigegetala.weebly.com/uploads/1/3/4/3/134311768/besikox.pdfIn PDF document text
    • http://urro-hu.com/suzinizagovivujupu1t25.pdfIn PDF document text
    • https://luwosixikitap.weebly.com/uploads/1/3/4/6/134628352/ddc952.pdfIn PDF document text
    • http://docita.fun/honda_generator_2000_user_manualpqjfv.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gigavolaxo.epizy.com/what_is_the_setting_of_the_rocking_horse_winner.pdfIn PDF document text
    • http://woxunegomuwajor.rf.gd/zasufelegov.pdfIn PDF document text
    • http://zotodigigaki.epizy.com/93173951438.pdfIn PDF document text
    • http://wunekoxewufomaf.epizy.com/john_deere_62c_mower_deck_parts_list.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_off0000f02d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF02D 5436 bytes
SHA-256: 02c62392ae12e444e5b6f4aad8c68bad4c60ff1a4b5c26e5273465005b367d2d
font_01_sfnt_off000102ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102AE 10536 bytes
SHA-256: bb850fc10f28baddfd1638824e3d3557db1414a397841eaca35360fd2d3a9b2f

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