Malicious PDF — malware analysis report

Static analysis result for SHA-256 b96b901b1a5fdd25…

MALICIOUS

PDF

84.1 KB Created: 2021-03-01 13:46:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 457c5cb7b62bb7aa83a0b325b78b0a20 SHA-1: 6ab808cb054346cd5bca206950b59a6e4c7c7822 SHA-256: b96b901b1a5fdd253452037360c4497782c9bb1f6deae1920f397d9bc447a0d8
192 Risk Score

Malware Insights

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

The PDF contains multiple heuristics indicating malicious intent, including links to known malicious redirectors and a link farm on disposable hosting. The ML classifier also strongly flagged this PDF as malicious. While no scripts were extracted, the presence of malicious links and the overall structure suggest the document is designed to lead the user to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://yafferge.ru/award?keyword=what+types+of+foods+are+complex+carbohydrates In PDF document text
    • http://zogasukod.22web.org/36162298472.pdfIn PDF document text
    • http://xoxibusu.iblogger.org/honda_gc160_5.0_pressure_washer_replacement_parts.pdfIn PDF document text
    • http://zalofamanaw.22web.org/guess_who_game_character_sheets.pdfIn PDF document text
    • http://connexion-amelii.xyz/94181294145zqfi5.pdfIn PDF document text
    • http://torevifij.iblogger.org/pokemon_fire_red_gba_emulator.pdfIn PDF document text
    • https://cdn.sqhk.co/xubipoxeguza/inPjcgc/lunek.pdfIn PDF document text
    • http://shortsomfj.space/futasa9eld5.pdfIn PDF document text
    • http://my-favshopf.online/calfresh_application_spanishqyyc3.pdfIn PDF document text
    • https://cdn.sqhk.co/reriwoduriju/jdjgaea/vibuv.pdfIn PDF document text
    • https://cdn.sqhk.co/suwixowefa/hFATNF6/octopus_s_garden_beatles_cartoon.pdfIn PDF document text
    • https://cdn.sqhk.co/milagaleja/bm685jf/suxawubevalopuwonoxig.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://maligufaribez.epizy.com/mario_platform_games_online.pdfIn PDF document text
    • https://s3.amazonaws.com/biwuwukesazef/68979495267.pdfIn PDF document text
    • https://s3.amazonaws.com/buwosevax/wobif.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_off00010c64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C64 5716 bytes
SHA-256: 50833b8c28bce88b314c90c1ef045f7cbffa2a23eec4a004009301722d90461a
font_01_sfnt_off00011fc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FC4 10308 bytes
SHA-256: 78f51a70c48164eb080e984283dbb4f456254703c0ecd70383f67f5aa772284a

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