Malicious PDF — malware analysis report

Static analysis result for SHA-256 4cc19c5176b8c381…

MALICIOUS

PDF

71.0 KB Created: 2021-01-14 05:08:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 92ae2e514dfd3b64e82cbf8e360bd364 SHA-1: e306fb31a4cfa41660cd1cf592fcf8504d362611 SHA-256: 4cc19c5176b8c3811dcca3b32b43a85ebf5ee85274b4d4ef7089b8ba7050c388
184 Risk Score

Malware Insights

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

This PDF file contains multiple embedded URLs, with at least one identified as a malicious redirector. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the PDF is designed as a link farm on disposable hosting, likely to funnel users to malicious sites. The ML classifier and ClamAV detection strongly support its malicious nature, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://cctraff.ru/123?utm_term=gramatica+2+capitulo+1+answer+key In PDF document text
    • https://site-1177860.mozfiles.com/files/1177860/nusuzedoz.pdfIn PDF document text
    • https://site-1174816.mozfiles.com/files/1174816/88492310561.pdfIn PDF document text
    • https://site-1166603.mozfiles.com/files/1166603/escape_room_the_game_app_chrono_decoder.pdfIn PDF document text
    • https://site-1166739.mozfiles.com/files/1166739/wajesu.pdfIn PDF document text
    • https://site-1083678.mozfiles.com/files/1083678/environmental_law_in_south_africa.pdfIn PDF document text
    • https://rifubagozoj.weebly.com/uploads/1/3/2/6/132695416/wamitopuz_kedesixokimu_sosofiriboge.pdfIn PDF document text
    • https://site-1175696.mozfiles.com/files/1175696/57865525422.pdfIn PDF document text
    • https://site-1168354.mozfiles.com/files/1168354/rechargegenie_top-_up_mobile_recharge_espanada.pdfIn PDF document text
    • https://loxerujose.weebly.com/uploads/1/3/0/7/130775489/8323896.pdfIn PDF document text
    • https://site-1171372.mozfiles.com/files/1171372/bitcoin_investment_in_botswana.pdfIn PDF document text
    • https://site-1173508.mozfiles.com/files/1173508/live_nettv_apk_4__6_free.pdfIn PDF document text
    • https://site-1176597.mozfiles.com/files/1176597/3362785228.pdfIn PDF document text
    • https://sawawinuta.weebly.com/uploads/1/3/1/6/131606003/5475315.pdfIn PDF document text
    • https://site-1175941.mozfiles.com/files/1175941/best_website_to_download_free_ringtones_for_iphone.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d497.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD497 5552 bytes
SHA-256: 8e8d109e1a500d18c81e663559f348811824a1ff67ab8e629e05e5f78a03649f
font_01_sfnt_off0000e786.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE786 12324 bytes
SHA-256: fe4c0f56103ad981a29d93e07abba21e9fe91962917c3b8a6869dbf54510cf3a

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