Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7416f1e137906c3…

MALICIOUS

PDF

86.1 KB Created: 2021-03-01 04:54:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: d08df6ebe58e24456ac5671c386e45a0 SHA-1: f5e3a7eab2a5cffd488ea612df73918cbf4a120e SHA-256: a7416f1e137906c3c544134c9d9c9d6f17c2275245ebf6d95cd6669e73cfe1c8
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of techniques used to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://mezovuduw.ru/strik?utm_term=taco+bell+nutrition+guide+pdf PDF link annotation
    • http://hocostyle.ru/zitebaxudogupuwetubukad2x2fg.pdfIn PDF document text
    • https://xexemisekugo.weebly.com/uploads/1/3/4/6/134679242/warun.pdfIn PDF document text
    • https://jubibololir.weebly.com/uploads/1/3/2/8/132814038/5114121.pdfIn PDF document text
    • https://sazuwigigaxav.weebly.com/uploads/1/3/1/4/131407293/zimalegonuvivu.pdfIn PDF document text
    • https://cdn.sqhk.co/tabewinudeka/dnjbgfG/hd_bike_wallpapers_for_mobile_phones.pdfIn PDF document text
    • http://nout-sale.site/421707675263gtzv.pdfIn PDF document text
    • https://kaferafodi.weebly.com/uploads/1/3/0/7/130775544/3437125.pdfIn PDF document text
    • https://cdn.sqhk.co/nuzifixe/POrijij/strawberry_shortcake_jumbo_coloring_book_apk_download.pdfIn PDF document text
    • https://gegaminowudajun.weebly.com/uploads/1/3/4/0/134041134/mutoju_ruxonapu.pdfIn PDF document text
    • https://cdn.sqhk.co/wudarivat/gc1hhjh/38211369960.pdfIn PDF document text
    • https://cdn.sqhk.co/jibenapola/hihfhb0/how_to_win_friends_and_influence_people_audiobook.pdfIn PDF document text
    • https://cdn.sqhk.co/sobupepokor/hgYaihB/47418905242.pdfIn PDF document text
    • https://cdn.sqhk.co/daposofoxig/YagfFhh/attack_on_titan_season_3_eren_voice_actor.pdfIn PDF document text
    • https://cdn.sqhk.co/surofowudula/jcihkha/71500471052.pdfIn PDF document text
    • https://memudejiremi.weebly.com/uploads/1/3/1/4/131405951/nufarabelaj_tikuputow.pdfIn PDF document text
    • https://cdn.sqhk.co/moxawitab/JjjaFPA/real_followers_pro_apk_old_version.pdfIn PDF document text
    • https://ramakizuwag.weebly.com/uploads/1/3/4/3/134321509/fexosopoze-jemuxor.pdfIn PDF document text
    • https://cdn.sqhk.co/padasagam/hchhPji/tower_defense_mod_apk.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off00011051.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11051 5232 bytes
SHA-256: 0c38dea1bb2fb90effddd8c5cb0ce5f391fb94fb6de30600151fdd0eaa5b8322
font_01_sfnt_off00012226.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12226 12260 bytes
SHA-256: e612a06858d945232a15c9feaa7be29ca6137e80a3ecad5f8c7cc2154c5cfeec

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