Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ffecf9d1b34b79b…

MALICIOUS

PDF

80.0 KB Created: 2021-02-16 19:41:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 38ee61d5618a1c812ba16f0cb7f0ba7b SHA-1: 9fa192e3df76b609f6bffc7e03762461bdd3d8ea SHA-256: 2ffecf9d1b34b79bf89fd3b89ab8e537b3812a13e412c6add79fa762df50e99b
244 Risk Score

Malware Insights

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

This PDF file is identified as malicious by multiple heuristics and a machine learning classifier, specifically flagged as a phishing trojan. It contains a large number of links, many pointing to disposable hosting, designed to create a link farm. One critical heuristic indicates a link to known malicious redirector infrastructure, suggesting the primary goal is to redirect users to harmful sites. While no scripts were explicitly extracted, the PDF structure and link farm indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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/wix?keyword=triangle+area+worksheet+with+answers In PDF document text
    • http://lesalufijo.iblogger.org/digital_clock_worksheets.pdfIn PDF document text
    • http://timurberg.ru/guvekipatobizejuteweex8fm.pdfIn PDF document text
    • https://cdn.sqhk.co/fapetemiji/ejdMhaZ/kung_fu_bergen_op_zoom.pdfIn PDF document text
    • https://cdn.sqhk.co/bawusipa/nhis0ji/strategic_property_management_reviews.pdfIn PDF document text
    • https://cdn.sqhk.co/bowawugafux/icTig1n/vemawofagukotebak.pdfIn PDF document text
    • https://cdn.sqhk.co/pemejurove/iaji3gc/petirumike.pdfIn PDF document text
    • http://shopmzm.site/how_long_does_it_take_for_a_puppy_to_fall_into_a_deep_sleeps94s4.pdfIn PDF document text
    • http://iblack.space/durapuruzutavws539.pdfIn PDF document text
    • https://pugulewex.weebly.com/uploads/1/3/1/4/131406013/cabd79.pdfIn PDF document text
    • https://cdn.sqhk.co/fuvonazavo/hcgcjhb/download_space_shooter_mod_apk_unlimited_money.pdfIn PDF document text
    • https://cdn.sqhk.co/xenudipu/hghg7cU/guidecraft_heartwood_kitchen_helper_white.pdfIn PDF document text
    • https://cdn.sqhk.co/verikiweneza/ieT0rgd/best_motorcycle_racers_of_all_time.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://zotuxegusam.epizy.com/tazelunikiliduwonag.pdfIn PDF document text
    • http://mepejolowu.rf.gd/27431627062.pdfIn PDF document text
    • http://zasegusof.epizy.com/sample_packs_ableton_live_9.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dac3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAC3 4840 bytes
SHA-256: 1602f079fe2057ba8af5789eeddab4e31d3ea083a8ff2c4fc962dfd8f81e5730
font_01_sfnt_off0000eb38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB38 10404 bytes
SHA-256: 3d1350703f0ab8760520e589f024c8d9558f88700e1696d26ea63dc35a631402
font_02_sfnt_off00010f23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F23 16196 bytes
SHA-256: 18337a07c9c44834262d20d91ee5da47d38261d0252b6cb37bc9cb74325b6b6a
font_03_sfnt_off00012450.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12450 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34