Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b86940cac9035fb…

MALICIOUS

PDF

74.6 KB Created: 2021-05-08 20:27:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 1fcb175c5794ba15b53518c0304845ae SHA-1: 1577c17dafa68eefb3e8f3b364276cedb0e9db7d SHA-256: 4b86940cac9035fb461b8b7df8babcd4bc98d3e10b2326c4e89ea78e5d971208
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains numerous external links, many pointing to disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The primary malicious URL identified is https://jottigo.ru/strik?utm_term=john+deere+l111+bagger+parts, which is likely part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 5

  • 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 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://jottigo.ru/strik?utm_term=john+deere+l111+bagger+parts PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4367644/normal_5ffdd120e3ffb.pdfIn PDF document text
    • https://cdn.sqhk.co/zixapegof/c5LYkif/v_model_in_software_engineering.pdfIn PDF document text
    • http://mamefumiwuto.mywebcommunity.org/aprender_portugues_gratis.pdfIn PDF document text
    • https://cdn.sqhk.co/fapetemiji/jQ30Oji/azamara_quest_address.pdfIn PDF document text
    • http://dududuw.mypressonline.com/defense_bill_2020.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375891/normal_6057b72425b7d.pdfIn PDF document text
    • https://cdn.sqhk.co/pefevepufi/hhfThic/little_boy_haircuts_for_thick_wavy_hair.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4487187/normal_5fce390c41d80.pdfIn PDF document text
    • http://ladebizelase.scienceontheweb.net/causative_passive_voice.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459641/normal_603e96c927b06.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444356/normal_6060179ca3cfb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://3d7c42e8-cad9-4196-8f3c-0f210fd97588.filesusr.com/ugd/1b7c00_ae4622dcbb72423badd647ea629529a6.pdf?index=trueIn PDF document text
    • http://bepolujogox.atwebpages.com/serato_dj_pro_software_price_in_india.pdfIn PDF document text
    • https://e06e8306-d71e-4c92-aa1b-e8c52eeb44cb.filesusr.com/ugd/bc4951_661496394c774af79bc42dd87bc2215b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/6d74bdf2-b807-4713-91da-7c2b102b14e2/moretepobipek.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7aaa92b7-822c-47eb-b0c3-cddad48effce/harry_potter_first_book_word_count.pdfIn PDF document text
    • https://3315be42-5dab-4b6e-b44d-105cb490973e.filesusr.com/ugd/2e3488_24093d9ad04d448e81e89836347bfe36.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/da7cb4d2-3c71-4b09-8145-3f932627f1d9/fire_and_ice_restaurant_hours.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_off0000e618.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE618 5404 bytes
SHA-256: 2ee5abd728877f868d034533cb125b9826ed89e287d82530d8f525f286b0d3b3
font_01_sfnt_off0000f867.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF867 10876 bytes
SHA-256: db0111e2301a1ad3978fd9b265b6a577fad0b1008505d5ef5ce642a4a526805e

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