Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f2e9adb12c17531…

MALICIOUS

PDF

77.7 KB Created: 2021-04-16 03:25:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: c00ef4433581b6c2f9e1ae5b646eccd8 SHA-1: e2e4463cdf89acda24d8c18ba3892127ec3bda87 SHA-256: 1f2e9adb12c175318fc16fad820c867ce7bd439205c5b00df041b628bc024a1c
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 phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing or SEO spam campaign, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://nipisod.ru/strik?utm_term=what+does+it+mean+when+a+tattoo+artist+says+books+closed PDF link annotation
    • http://cosmicgig.com/murevidugakabamuke9jks1.pdfIn PDF document text
    • http://savadaqwe.space/nanda_nursing_diagnosis_for_nose_bleedingu119f.pdfIn PDF document text
    • https://kodavagimiwebod.weebly.com/uploads/1/3/5/3/135346487/kazigepaxageteva.pdfIn PDF document text
    • https://komibaxes.weebly.com/uploads/1/3/1/6/131606619/2370116.pdfIn PDF document text
    • https://guzesunidami.weebly.com/uploads/1/3/0/8/130873942/gewarelubanajobug.pdfIn PDF document text
    • https://jirafaribov.weebly.com/uploads/1/3/4/5/134599686/segerijejosijok_jogit.pdfIn PDF document text
    • https://kibanelamuvudu.weebly.com/uploads/1/3/0/9/130969844/jujubojaped.pdfIn PDF document text
    • https://mevinabepoke.weebly.com/uploads/1/3/2/7/132740553/zuritoxufuxeduj.pdfIn PDF document text
    • http://lessonsonline.site/nirukarufunasopopowheml8.pdfIn PDF document text
    • https://lisesadavageg.weebly.com/uploads/1/3/1/4/131438313/juxub.pdfIn PDF document text
    • https://kofijowuz.weebly.com/uploads/1/3/4/4/134446653/4103487.pdfIn PDF document text
    • http://shop-you.xyz/pinazowavutosududikakagbmt63.pdfIn PDF document text
    • http://cpskras.website/38133746222pwqxu.pdfIn PDF document text
    • http://tvoeobrazovanie.fun/account_form_4_bab_22j9aj.pdfIn PDF document text
    • http://netlysy.online/bissell_turboclean_powerbrush_pet_carpet_cleaner_2987h1zys.pdfIn PDF document text
    • http://baltika-trans.com/why_is_my_garbage_disposal_leaking_out_the_bottom0twr2.pdfIn PDF document text
    • https://ropoluwuxonixol.weebly.com/uploads/1/3/4/6/134692090/5111634.pdfIn PDF document text
    • https://serutoposax.weebly.com/uploads/1/3/5/3/135398922/joberakivevaxuke.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xigufogadenake.epizy.com/18718782911.pdfIn PDF document text
    • http://wetovokerug.epizy.com/luludivupo.pdfIn PDF document text
    • https://s3.amazonaws.com/vanatul/85953337561.pdfIn PDF document text
    • http://lezapogitoda.rf.gd/39200275431.pdfIn PDF document text
    • https://s3.amazonaws.com/toliwudalamem/garmin_drive_50lm_battery.pdfIn PDF document text
    • https://s3.amazonaws.com/xamibebulosaxug/pevomomunuva.pdfIn PDF document text
    • http://sidakofonol.epizy.com/zotulataperexixi.pdfIn PDF document text
    • https://s3.amazonaws.com/pafiganovavi/88410176660.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_off0000f2c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2C8 5592 bytes
SHA-256: 127bd945a86d6d7a4a8ec6c378cc3bf19b19100b7db5cdcbc3d89331185a1ae1
font_01_sfnt_off000105bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105BC 10184 bytes
SHA-256: d7487d7dc6d8c4d0d8e15f2789a3fbb415a1545fab2634ecfe3dd520b66534bc