Malicious PDF — malware analysis report

Static analysis result for SHA-256 8454b8bee6ec8639…

MALICIOUS

PDF

83.8 KB Created: 2021-04-14 12:50:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: d1ceb74d5aa48efeddaa115d497fe602 SHA-1: affaa7d4e5f8868abbcacc83e2d73439d38b00cc SHA-256: 8454b8bee6ec8639f0b9a709432371fc4835e5ac15c9aa7d6133e770c1cd1a74
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to potentially malicious content. The presence of a URL with a 'utm_term' parameter further supports the idea of a campaign aimed at driving traffic, possibly for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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=how+to+use+interdynamics+ez+chill PDF link annotation
    • https://cdn.sqhk.co/wubunepan/egeJicH/lotejilifobemopeno.pdfIn PDF document text
    • https://cdn.sqhk.co/vozeseseber/Chg17ha/beli_pulsa_telkomsel_murah.pdfIn PDF document text
    • https://cdn.sqhk.co/siwemawatu/jaOgeie/nepoxunixujubitanu.pdfIn PDF document text
    • https://cdn.sqhk.co/suzeboxiwo/ijEjdhg/flappy_dunk_apk_download.pdfIn PDF document text
    • https://cdn.sqhk.co/zepipawetopi/Egg6hcQ/55241621684.pdfIn PDF document text
    • https://cdn.sqhk.co/jivumigen/eWhdjbA/rawovavavuzivori.pdfIn PDF document text
    • https://cdn.sqhk.co/didatife/73NjP0H/digicel_sales_application.pdfIn PDF document text
    • https://cdn.sqhk.co/mazasofuw/jVieie3/conde_nast_traveller_london_guide.pdfIn PDF document text
    • http://kebawabo.22web.org/24839236422.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/78021841-8a88-4ecf-881f-d02a080adc33/maytag_top_load_washer_owners_manual.pdfIn PDF document text
    • https://e209d09f-5af8-48a0-acfc-72d03e9bea0d.filesusr.com/ugd/946fcc_4ab3785a84264b469df7135bc7c964b2.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bidurudilidujug/galekuf.pdfIn PDF document text
    • https://e42ce0b3-f376-4cb5-9abe-507fdbb9570c.filesusr.com/ugd/603474_4f0a0dcda9f64556bf27171d181aefe1.pdf?index=trueIn PDF document text
    • http://gonekiwefed.epizy.com/english_advanced_vocabulary_and_structure_practice_key.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/48eaab09-5923-4569-903c-d75355de6693/which_roku_remotes_have_headphone_jack.pdfIn PDF document text
    • https://s3.amazonaws.com/belopudevuzuza/barrenadora_manual_en_chile.pdfIn PDF document text
    • http://xawuxona.epizy.com/19481562603.pdfIn PDF document text
    • https://s3.amazonaws.com/jazofi/data_science_masters_worth_it_reddit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3c10a9f3-fc83-47c8-8f9c-cbb9c6b0fb4f/it_stephen_king_characters.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cdc9c346-c491-4a3c-9658-dd72c83620ed/alkaline_based_diet_benefits.pdfIn PDF document text
    • http://wisunomimat.epizy.com/suxazufanufejuleresexuso.pdfIn PDF document text
    • https://s3.amazonaws.com/fujadabez/52875025266.pdfIn PDF document text
    • https://2a4065d7-883d-43e8-a524-7ce9aa4b4e88.filesusr.com/ugd/ccb1c6_421d926c821d4b68875c58d3352399ca.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/9cd55685-a350-4e60-b49f-301e0b315374/best_wireless_keyboard_and_mouse_combo_in_india_2020.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_off0001064f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1064F 5384 bytes
SHA-256: 34079f583cb14501324a49261099f8718a9056ae2d529a6fb48449a62d2e81e8
font_01_sfnt_off0001188c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1188C 12096 bytes
SHA-256: 4dd924ab3464ba3d393728e7f3b87a32fd0e78422c215e453c6580b2e22a5c29