Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e8a23fdf04f24c6…

MALICIOUS

PDF

73.7 KB Created: 2021-03-02 22:57:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: bc69c3fb4bb0863cf098ba858f1d0f01 SHA-1: 79c086a256c875325ca380432d32208a5438bfaf SHA-256: 7e8a23fdf04f24c684d95e29afd1559f977a6c046d83072a3d741e38fb72f0b7
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF contains multiple embedded links, with at least one pointing to known malicious redirector infrastructure. The heuristic firings indicate the document is designed as a link farm on disposable hosting, aiming to direct users to malicious sites. The ML classifier and ClamAV detection strongly support its malicious nature, likely for phishing or malware distribution.

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
  • 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.
  • 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://crophysi.ru/strik?utm_term=wacom+intuos+pro+pth-651+pen In PDF document text
    • http://bigijawiv.scienceontheweb.net/how_can_you_tell_how_old_a_hot_water_heater_is.pdfIn PDF document text
    • https://nesexije.weebly.com/uploads/1/3/1/6/131607346/vopegul_zigop.pdfIn PDF document text
    • https://cdn.sqhk.co/dofexoxev/xFzjbjj/gevamuzujuj.pdfIn PDF document text
    • http://zusiwibewire.mypressonline.com/gularalaponivigox.pdfIn PDF document text
    • https://letunaxure.weebly.com/uploads/1/3/1/3/131383761/warunenesusijuja.pdfIn PDF document text
    • https://cdn.sqhk.co/gosukutusu/bLhijhU/ninja_foodi_air_fryer_recipes_chicken_breast.pdfIn PDF document text
    • https://cdn.sqhk.co/lunemitibojo/ig43h6e/stick_shadow_war_fight_apk_mod.pdfIn PDF document text
    • http://good-production18.site/pictoword_game_cheats_level_98beq32.pdfIn PDF document text
    • http://fukiwurezopukof.mywebcommunity.org/6098423011.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lumosaneja.onlinewebshop.net/91711720274.pdfIn PDF document text
    • https://s3.amazonaws.com/fuzafuzeruwit/android_lifecycle_example.pdfIn PDF document text
    • http://mawabubobiniz.rf.gd/ashes_cricket_2009_wii_iso.pdfIn PDF document text
    • http://milebulijulami.onlinewebshop.net/teboxepoxazuz.pdfIn PDF document text
    • https://s3.amazonaws.com/lovetijif/45717144277.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_off0000e205.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE205 5516 bytes
SHA-256: 5ff0d04b78841f3c2fddbf48acf2fb92b507cb4874e4cc4fa6412b151565aace
font_01_sfnt_off0000f4b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4B9 10928 bytes
SHA-256: 6f3a9459ab6f2ec46f321547cb9db57b7130f703351b9de38cb483e8d6f77c24

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