Malicious PDF — malware analysis report

Static analysis result for SHA-256 aebfe66ba5af9aeb…

MALICIOUS

PDF

70.7 KB Created: 2021-05-24 12:11:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 3fe8c43038564ae2953b71e9a84e6389 SHA-1: 683fa3f26b03c392190d6c93e4f31b1b883faddf SHA-256: aebfe66ba5af9aebdcd73a4e6517f66048a51996c113f93efa800dc5dd4884c7
186 Risk Score

Malware Insights

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

This PDF file exhibits characteristics of a link farm, with numerous embedded URLs pointing to various PDF documents. The primary malicious URL, 'https://resalured.ru/strik?utm_term=the+book+of+mirdad+audiobook', is likely used for phishing or to distribute further malware. The heuristic firings, including PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM, strongly indicate this malicious intent. ClamAV also detected this file as Pdf.Phishing.Trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://resalured.ru/strik?utm_term=the+book+of+mirdad+audiobook PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4470833/normal_606757a5d72a7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365621/normal_5fe51cfbe5d30.pdfIn PDF document text
    • https://pedidifapa.weebly.com/uploads/1/3/0/8/130874671/xipufojarari.pdfIn PDF document text
    • https://fomilapemarujan.weebly.com/uploads/1/3/0/8/130814088/zodirevebupotu.pdfIn PDF document text
    • https://kupelaranix.weebly.com/uploads/1/3/4/7/134729830/1297d.pdfIn PDF document text
    • https://gemumumesuligiv.weebly.com/uploads/1/3/4/3/134318519/3251397.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
    • https://uploads.strikinglycdn.com/files/2d062ed1-7f00-47ca-9c00-cd8775ba9674/35424045874.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e130cfb6-c406-49fb-8aa0-e03d3414e4d9/what_are_three_facts_about_brown_bears.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/642d75e4-9351-4ffb-a7ea-61d71d067408/rasibuju.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1b7fc270-d805-403f-a8ef-0ee41a52232e/5_major_bodies_of_water_in_canada.pdfIn PDF document text
    • https://s3.amazonaws.com/fuwuzerijofa/taco_bell_cinnamon_twists_nutrition_information.pdfIn PDF document text
    • https://s3.amazonaws.com/purufiz/vivavideo_pro_video_editor_apk_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/029f2629-67e0-4a8d-89a1-7898be13364c/57436863415.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/673c8bee-6d14-46ad-9295-e10dd437b4fa/halliday_resnick_walker_fundamentals_of_physics_8th_edition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bcc43858-e2cc-478e-9c87-9afbcb72348d/what_is_8_p_in_marketing.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f83bd111-e321-41f9-a242-bd6d60e575cd/best_weight_exercises_for_arms_and_chest.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1858ca43-b16f-4edf-9f44-4648792f23b1/korabunejobesubixigixu.pdfIn PDF document text
    • https://s3.amazonaws.com/tadevewuju/sidawoxopusifara.pdfIn PDF document text
    • https://s3.amazonaws.com/nowonovege/38851159074.pdfIn PDF document text
    • https://s3.amazonaws.com/xufaxoferugod/93068068583.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cd27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD27 4784 bytes
SHA-256: ed87b13d077e146fee82ebb4867b8788edeb6f34d3f55672c8ddc4c760a45205
font_01_sfnt_off0000dd61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD61 9932 bytes
SHA-256: 1c27b43af79fc48ff23cf5801aa35192022987469059474064dbb8759600a080
font_02_sfnt_off0000ff72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF72 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2