Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd3a7e9a10adcc3a…

MALICIOUS

PDF

75.9 KB Created: 2021-03-03 10:01:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-13
MD5: 6a88244a2afc3c80290b51bf446eb64c SHA-1: a7e88b35286cb9af24964f099fc37fcd936b8ebd SHA-256: cd3a7e9a10adcc3a3a4725e67b6dc7e714eeb5200ae199d62c4d7177c089349e
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 embedded URLs, many pointing to disposable domains, suggesting a link farm or phishing operation. The document body, though heavily obfuscated, contains metadata related to wkhtmltopdf and a date, but no clear textual lure. The presence of external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly suggest the document's purpose is to redirect users to potentially harmful external sites.

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://jacksth.ru/wix?keyword=minnesota+deer+hunting+guides PDF link annotation
    • http://tadenexibegujam.22web.org/moon_river_clarinet_sheet_music_free.pdfIn PDF document text
    • https://cdn.sqhk.co/nupopobax/ibrq9hg/zavomodunox.pdfIn PDF document text
    • https://cdn.sqhk.co/getabemuto/iffjfji/easy_facial_mask_for_acne.pdfIn PDF document text
    • https://cdn.sqhk.co/fapiwejagiz/Ligfgcv/monkey_sounds_mp3_ringtone.pdfIn PDF document text
    • http://lesitegu.iblogger.org/what_does_yellow_triangle_mean_on_arlo_camera.pdfIn PDF document text
    • http://gopubewigofopa.iblogger.org/35772954778.pdfIn PDF document text
    • https://cdn.sqhk.co/bikugipozamu/XMdSjgR/3d_table_tennis_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/sebixodof/jjicggb/cat_jumping_into_ceiling_fan_tiktok.pdfIn PDF document text
    • http://gejobukopap.iblogger.org/ophthalmology_abbreviations.pdfIn PDF document text
    • http://instacopyrighthelpteam.com/jade_moves_mortal_kombat_xbox_360pyqqu.pdfIn PDF document text
    • https://cdn.sqhk.co/jaxabofapuw/fhhifH0/loweliguditutonij.pdfIn PDF document text
    • http://fizovovapoz.iblogger.org/google_fonts_link_stylesheet.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://konajif.epizy.com/aery32_glider_software.pdfIn PDF document text
    • https://s3.amazonaws.com/doxifuba/karogirodividano.pdfIn PDF document text
    • https://s3.amazonaws.com/vukusa/bijetevijokipezafupafu.pdfIn PDF document text
    • http://jaziwovapotulit.epizy.com/dragon_age_2_companion_tactics_guide.pdfIn PDF document text
    • http://molitumulejoji.rf.gd/daily_guideposts_2018_online.pdfIn PDF document text
    • http://pilulozames.epizy.com/kaligozomutomip.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_off0000eba0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBA0 5060 bytes
SHA-256: 5c68fa344020ef60d0586de47c48caa2bdc1ff523c7d7d70fd9dbdd638a9a9fe
font_01_sfnt_off0000fcd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCD9 10908 bytes
SHA-256: 8353bf7d45de680e3d7fc94d8d18b7f0059b7d6d4623e4c809b309c7016a26b3

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