Malicious PDF — malware analysis report

Static analysis result for SHA-256 12a8d844ae34bd57…

MALICIOUS

PDF

94.2 KB Created: 2021-02-19 20:58:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 330161a49c7a399a1dbedd154b10964f SHA-1: 5c3c2a2026c04a7299c30b5b4a4d0b9f7e117f5b SHA-256: 12a8d844ae34bd579b87671760f73f6d662aa8bc25daadf66d5a49645b80c421
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by multiple critical heuristics as a malicious redirector and link farm. It contains numerous embedded URLs pointing to various domains, many of which are hosted on disposable or dynamic DNS services. The ML classifier also strongly indicated maliciousness. The primary purpose appears to be directing users to external, potentially malicious, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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 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.
  • 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://crophysi.ru/strik?utm_term=is+the+assassin+on+netflix In PDF document text
    • http://forecast.bet/363591370115h6x2.pdfIn PDF document text
    • https://xikemusuvef.weebly.com/uploads/1/3/4/3/134322181/1273212.pdfIn PDF document text
    • https://cdn.sqhk.co/xuxawexa/riiE53I/strategy_plan_document.pdfIn PDF document text
    • http://zotonurapad.22web.org/ara_ra_ra_marathi_song_pagalworld.pdfIn PDF document text
    • https://gunulavosaki.weebly.com/uploads/1/3/4/3/134374607/7e13e5f51e59.pdfIn PDF document text
    • https://cdn.sqhk.co/duxadikoti/zjcicvZ/kofevupudubemejufigejanoj.pdfIn PDF document text
    • https://cdn.sqhk.co/joxesinejag/jczLojj/neon_tube_driver_circuit.pdfIn PDF document text
    • https://rodagekutav.weebly.com/uploads/1/3/5/3/135313742/ff146cb12.pdfIn PDF document text
    • https://cdn.sqhk.co/bamopilu/4jj4oib/cash_app_card_activation_problem.pdfIn PDF document text
    • https://gejodawutu.weebly.com/uploads/1/3/1/1/131164152/e38d7bf37e46.pdfIn PDF document text
    • https://cdn.sqhk.co/jevamivuvugi/MhjGWjd/multi-_strike_pokertm_1_free_video_poker.pdfIn PDF document text
    • http://furniture21.online/catlogo_jequiti_em3u8hw.pdfIn PDF document text
    • http://artelamp.store/geerlik_ve_gvenirlik_almas0u7ih.pdfIn PDF document text
    • http://zogigokilogipex.22web.org/music_sheet_pirates_caribbean_theme_song.pdfIn PDF document text
    • https://dobumixil.weebly.com/uploads/1/3/0/7/130738680/ea1e97b0ae1c109.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lipojutezudu.rf.gd/creative_cv_template_word_doc.pdfIn PDF document text
    • https://s3.amazonaws.com/fajonubinomeder/24147797941.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_off000132fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132FA 4764 bytes
SHA-256: 7490e2b4a89f3bd3bcace03762fee3948c745004a234be38bcb17ba05294c9c8
font_01_sfnt_off00014333.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14333 11888 bytes
SHA-256: f39dffbadda36934d0f264555e5a11c7e5837a3cddf36c64a67fadb97fbd75b5

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