Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e3a0b4f29fe49c5…

MALICIOUS

PDF

80.5 KB Created: 2021-03-25 07:05:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: d83b68efe011de07cb27723ed477dd80 SHA-1: 08086ca9f73ce8437748f1a70dd7eec21cb875bb SHA-256: 1e3a0b4f29fe49c5c1c48d5aba936326d94aec6f9163601653683f985e0ae8ff
194 Risk Score

Malware Insights

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

This PDF file is identified as malicious by multiple heuristics and a machine learning classifier. It contains a link farm with numerous external URLs, many hosted on disposable domains, suggesting a phishing or malware distribution attempt. The primary malicious URL identified is https://pelibifir.ru/strik?utm_term=hp+deskjet+3050+j610+series+driver+mac, which is likely a lure for downloading a malicious payload disguised as a printer driver. No scripts were extracted, but the PDF structure and embedded links strongly indicate a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://pelibifir.ru/strik?utm_term=hp+deskjet+3050+j610+series+driver+mac PDF link annotation
    • https://jorevubo.weebly.com/uploads/1/3/4/8/134869484/buzifina.pdfIn PDF document text
    • https://jufoxaju.weebly.com/uploads/1/3/4/4/134489692/6167911.pdfIn PDF document text
    • http://ribavid.medianewsonline.com/91195357790.pdfIn PDF document text
    • https://tuberosaguxe.weebly.com/uploads/1/3/1/4/131437792/zedofude.pdfIn PDF document text
    • https://towotadop.weebly.com/uploads/1/3/2/6/132682697/rupagag_fekedefobovex.pdfIn PDF document text
    • https://puwibovur.weebly.com/uploads/1/3/4/6/134639487/rutivituj-pumagebisejil-sipusawedet.pdfIn PDF document text
    • https://xadifopelizil.weebly.com/uploads/1/3/4/7/134771643/4871884.pdfIn PDF document text
    • http://suvuxivenorum.mypressonline.com/circular_motion_formulas.pdfIn PDF document text
    • https://woniwisupu.weebly.com/uploads/1/3/4/2/134266019/laruxitujovin.pdfIn PDF document text
    • https://wiwupaluw.weebly.com/uploads/1/3/1/6/131606778/dabokakijexu.pdfIn PDF document text
    • https://dosijikapok.weebly.com/uploads/1/3/2/6/132682778/b3ca7d7bf2e01.pdfIn PDF document text
    • https://jasitonil.weebly.com/uploads/1/3/4/0/134096785/8aeb92.pdfIn PDF document text
    • https://lepepapiminokuj.weebly.com/uploads/1/3/4/4/134493398/gewikiwi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/f7efc9be-9158-4e29-930f-2fe4634e80ae/23299399653.pdfIn PDF document text
    • https://s3.amazonaws.com/xeruxaxer/fascismo_en_espaa.pdfIn PDF document text
    • http://gipebevu.atwebpages.com/sexinojowukuwud.pdfIn PDF document text
    • http://zodiripek.myartsonline.com/cmm_capability_maturity_model.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7580a0b1-a24e-4380-b9c7-65e95681309a/vizio_vo320e_replacement_stand.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1dc94e53-b9b9-455b-9734-2b38f5de5dba/21866108858.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5f21df9d-dfb2-4561-9d53-865a8abf0d14/tozuzudeduve.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d9f0ebf3-141e-4a99-a1ab-0db663e55519/sword_art_online_games_pc_list.pdfIn PDF document text
    • https://s3.amazonaws.com/fadadedezeker/11280709358.pdfIn PDF document text
    • http://majezomisi.myartsonline.com/tuxazoniwisilijasojizifid.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_off0000ee3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE3F 5984 bytes
SHA-256: a47b068ca8f7587caea5cc177befc59cfe192baea5a2fe6a407d7ba4030d6430
font_01_sfnt_off0001029f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1029F 15464 bytes
SHA-256: 2207af2a4f39b1af34618efe16d57686a76c205f834da5bfb4b4f52f7e2a9b22