Malicious PDF — malware analysis report

Static analysis result for SHA-256 efbb11931b5edc64…

MALICIOUS

PDF

65.0 KB Created: 2021-02-21 20:30:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 8f94d051fbccc286ed8bb492abc69412 SHA-1: 5e45c8e4ea25257241c6adfed2f2ba3b2747c9f9 SHA-256: efbb11931b5edc64dbf2a8c3e485a76b98f1d6eaefbedf864b648a6c9f1b17da
244 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical finding for linking to known malicious redirector infrastructure and a large link farm. The ML classifier also assigned a high probability of maliciousness. The document body, though heavily obfuscated, contains references to 'Performax 16-32 plus conveyor belt' and 'wkhtmltopdf', suggesting a lure document. The presence of numerous embedded URLs pointing to disposable domains indicates a likely phishing or SEO spam campaign.

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=performax+16-32+plus+conveyor+belt In PDF document text
    • https://cdn.sqhk.co/boxadiweteve/id30Jgi/hedgehog_wallpaper_for_bedrooms.pdfIn PDF document text
    • http://andyhong.blog/steel_tank_weight_calculator_excel8j0xl.pdfIn PDF document text
    • https://cdn.sqhk.co/sopiloroda/ZRFKJ4u/47197402969.pdfIn PDF document text
    • http://bupetud.xyz/how_to_install_evenflo_car_seat_base_rear_facingrhsx1.pdfIn PDF document text
    • https://cdn.sqhk.co/wepurodapike/jagcRe3/speak_to_the_manager_app.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4389104/normal_600741c792a3e.pdfIn PDF document text
    • http://remont-kvartir-otzyvy.moscow/pinouts_for_a_crossover_cableaeerc.pdfIn PDF document text
    • https://cdn.sqhk.co/napumefu/fgfDric/snake_vs_block_free.pdfIn PDF document text
    • http://sandiego-podcasts.com/assistant_pro_for_android_23._33_apk_downloadawd0m.pdfIn PDF document text
    • https://cdn.sqhk.co/lasijutag/iangido/rutavedep.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369153/normal_5fd3462f5e6c8.pdfIn PDF document text
    • https://pepomujotopulog.weebly.com/uploads/1/3/4/8/134873529/69cdbb.pdfIn PDF document text
    • http://topuniversityru.fun/ben_10_coloring_book_free_downloadni7d0.pdfIn PDF document text
    • https://cdn.sqhk.co/kiribikiv/NghKnsz/can_you_escape_the_50_rooms_level_29.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://rinurevidipefiv.rf.gd/51997013451.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b20e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB20E 5900 bytes
SHA-256: 02499ca431daf936eb971c94767e5c1c541d4f0331e38040c54cb6c7b5ff5f79
font_01_sfnt_off0000c62a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC62A 10092 bytes
SHA-256: 0a8c1d491da359e065f7901eb8e3807744aca644d3ac564457f7c8bb4c398530
font_02_sfnt_off0000e8d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8D4 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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