Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed1b374b1053f88f…

MALICIOUS

PDF

131.4 KB Created: 2021-03-15 21:52:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 45246f5aa6c65de2adb7430513a8046f SHA-1: a49ec67d8038b8b362aaea0f32f883e53135820d SHA-256: ed1b374b1053f88fecb9e3408cd53c843fbcaeb08f9c4fbedb054912e751f2cd
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://kuzutuzo.ru/aws?utm_term=node+js+referenceerror+document+is+not+defined PDF link annotation
    • https://towipikegogu.weebly.com/uploads/1/3/4/6/134690187/volefivoto-wuxulexukugik.pdfIn PDF document text
    • https://cdn.sqhk.co/kazamepa/ajjyjen/zombie_catchers_hack_unlimited_plutonium.pdfIn PDF document text
    • http://load-bcp.com/how_to_organise_a_gardent5hwx.pdfIn PDF document text
    • https://ritojajugub.weebly.com/uploads/1/3/5/9/135984917/waxagetixisa.pdfIn PDF document text
    • http://wowovamofuzo.sportsontheweb.net/sheet_metal_forming_methods.pdfIn PDF document text
    • https://zizovotitimojuv.weebly.com/uploads/1/3/2/7/132712514/pizixevafi.pdfIn PDF document text
    • http://jijufik.22web.org/batman_wallpaper_free_for_pc.pdfIn PDF document text
    • https://cdn.sqhk.co/kesufetumo/ggetjfP/music_theory_guitar_book.pdfIn PDF document text
    • http://bafedudovodamo.medianewsonline.com/10880118518.pdfIn PDF document text
    • https://cdn.sqhk.co/jututumogu/ajeibIk/xoluwesekajowujenolipikod.pdfIn PDF document text
    • https://fezadegijowazon.weebly.com/uploads/1/3/4/0/134096780/jebofakef.pdfIn PDF document text
    • http://vowitufafuzebil.scienceontheweb.net/is_it_okay_to_microwave_chicken_nuggets.pdfIn PDF document text
    • https://kurepisafigovu.weebly.com/uploads/1/3/1/3/131398088/3811768.pdfIn PDF document text
    • http://dujaliz.iblogger.org/install_asciidoctor_mac.pdfIn PDF document text
    • https://cdn.sqhk.co/potonefamuve/8Vjfjdf/78640621486.pdfIn PDF document text
    • https://pizofozinolom.weebly.com/uploads/1/3/4/4/134459645/7835975.pdfIn PDF document text
    • https://kepegefamoza.weebly.com/uploads/1/3/1/3/131398453/6014699.pdfIn PDF document text
    • http://persequen.com/2013_civic_service_manual5bj1z.pdfIn PDF document text
    • http://hookup754.fun/41510531783gty7j.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://xawixojupaxixan.onlinewebshop.net/bafesej.pdfIn PDF document text
    • http://fopovixiwi.epizy.com/zanugiferade.pdfIn PDF document text
    • http://bumurulepowele.myartsonline.com/honda_element_manual_transmission_rebuild_kit.pdfIn PDF document text
    • http://wuwovedivaz.rf.gd/frigidaire_-_retro_1.6_cu._ft._mini_fridge_-_pink.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000102be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102BE 58880 bytes
SHA-256: fb1c824f8a579cfd2655f0a01c73074eb228490de464c5d5ac29de23fe83a947
font_01_sfnt_off0001b6cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B6CB 4852 bytes
SHA-256: 31942954962b611fd3e7852bd0819fee1da68a4cfacce899a73ab6df16a55019
font_02_sfnt_off0001c73f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C73F 12352 bytes
SHA-256: c6e10dc7da33b9cc322e468227911514ff3e8d819810af07f117ff6afe024ae0
font_03_sfnt_off0001f153.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F153 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f