Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e5f3fbab550dd0b…

MALICIOUS

PDF

79.0 KB Created: 2021-03-24 06:32:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 90d893d2e2466c4bf209433d5f1aa110 SHA-1: a3981cc0fc159f1b5944906f79764d526afbd816 SHA-256: 9e5f3fbab550dd0b421228a0096c1cac31358757b492e0477840818c1f9fc1d3
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 designed to distribute traffic to various malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a malicious document designed to redirect users through a network of potentially harmful URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://xezojetit.ru/award?keyword=blue+jackets+manual+23rd+edition+pdf
    • https://wepovibixig.weebly.com/uploads/1/3/4/0/134040587/2907003.pdf
    • http://bamirajewenexo.medianewsonline.com/namilisegademulitokumi.pdf
    • https://cdn.sqhk.co/saguregifu/eijULhd/145534748.pdf
    • https://fifukujujaki.weebly.com/uploads/1/3/2/6/132680890/varepija.pdf
    • http://lazisirogabidir.mypressonline.com/adjectives_and_adverbs_practice.pdf
    • https://cdn.sqhk.co/kigimijexap/jeRvyDP/jojo_soundboard_apk.pdf
    • http://xawegap.mywebcommunity.org/ace_academy_gate_books.pdf
    • https://cdn.sqhk.co/duxadikoti/JFngiSH/pizasikapip.pdf
    • https://kesizizuju.weebly.com/uploads/1/3/4/3/134384541/konuroro.pdf
    • https://japapetokanov.weebly.com/uploads/1/3/1/4/131454126/8133525.pdf
    • http://dapajurop.mygamesonline.org/namurifirij.pdf
    • https://juwomazitebuden.weebly.com/uploads/1/3/1/4/131414743/takakisa.pdf
    • http://nadipewin.mywebcommunity.org/hubspot_buyer_persona.pdf
    • https://cdn.sqhk.co/jimavidozeze/iiiggh3/charlottenburg_park_canada_day.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/d10f451b-95fd-4d91-9d03-54941da78b21/pozelejufugabeni.pdf
    • http://zijiwaras.onlinewebshop.net/eclipse_rcp_book.pdf
    • https://uploads.strikinglycdn.com/files/62e65614-2765-4d9d-a0f8-516c87d50c9d/75056943513.pdf
    • https://315736c7-1030-4200-8d24-05c9f4951019.filesusr.com/ugd/d19ca0_c97d6314640c47dd8a896af246e26524.pdf?index=true
    • https://uploads.strikinglycdn.com/files/ba4bb2a7-1a2f-469f-a061-704a857e38b9/calories_bojangles_cajun_filet_chicken_biscuit.pdf
    • https://uploads.strikinglycdn.com/files/59b2ddf6-fb72-4a97-bd62-ae2017f6a1f5/matlab_programming_language_example.pdf
    • https://6cdf8c5e-36a0-4b6d-987f-32d3d50030cd.filesusr.com/ugd/3c2e2e_5e73852138094b92a67ad7b0c52a239b.pdf?index=true
    • https://a146b927-ed54-472d-b3a8-6b137e313b92.filesusr.com/ugd/4d400c_c1254fca57f54b9cbea9996a838899e4.pdf?index=true
    • http://fepetixapokurob.myartsonline.com/lonely_planet_japan.pdf
    • http://sutexuvidag.myartsonline.com/nonorex.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f4a1.bin
ca445c580e7c795ce25a5defc57f6ca2634fbdf872626cff1ffc8625110463ff		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF4A1 5784 bytes
font_01_sfnt_off00010843.bin
ee2980b7bd69d474089afc270e99c41f89bd7f3038d3609bd2ccd638c580a7e8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10843 10568 bytes

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