Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3b5507a42b3c1b3…

MALICIOUS

PDF

87.2 KB Created: 2021-04-29 19:44:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: c08cf2d985de96e3532075a9d2eaf1c5 SHA-1: 5e8ff944687372f4996f0cbddfdf511e7f69056b SHA-256: a3b5507a42b3c1b3bda10ce0114fc17b3320ed812098a47da41baba2e00cbded
186 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or redirection scheme designed to lead users to potentially harmful websites. The embedded content, while appearing technical, likely serves as a lure to encourage clicks on these external URLs.

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
  • 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://kuzutuzo.ru/strik?utm_term=caterpillar+70+pin+ecm+wiring+diagram PDF link annotation
    • https://jedidaril.weebly.com/uploads/1/3/4/6/134687024/9873470.pdfIn PDF document text
    • https://cdn.sqhk.co/dedogupazib/MRtvZgh/podozisutowifikulepi.pdfIn PDF document text
    • https://vumifedesonuzik.weebly.com/uploads/1/3/4/8/134849268/toros.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4376850/normal_5fe2900808f09.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456114/normal_602b7a72d865f.pdfIn PDF document text
    • https://pedesidava.weebly.com/uploads/1/3/4/3/134355179/5593668.pdfIn PDF document text
    • https://cdn.sqhk.co/xaleteser/elmL8ic/spotify_premium_apk_xda.pdfIn PDF document text
    • https://teguzefememefa.weebly.com/uploads/1/3/4/6/134609716/modezidipu.pdfIn PDF document text
    • https://cdn.sqhk.co/mekurapiw/P8Mlja6/biziwe.pdfIn PDF document text
    • https://cdn.sqhk.co/siloneza/cDjaggG/building_molecular_models_worksheet_answers.pdfIn PDF document text
    • https://cdn.sqhk.co/nugilatunu/jAhbWFM/64540417157.pdfIn PDF document text
    • https://cdn.sqhk.co/juvexafi/hc2Lvha/28640254597.pdfIn PDF document text
    • https://cdn.sqhk.co/vipikunowi/jjyFgfn/datod.pdfIn PDF document text
    • http://libuwapuvewipev.mywebcommunity.org/78988519559.pdfIn PDF document text
    • https://talidifixuj.weebly.com/uploads/1/3/5/3/135390844/lisesal.pdfIn PDF document text
    • http://xefawojuj.mygamesonline.org/yardman_mower_parts_manual.pdfIn PDF document text
    • https://cdn.sqhk.co/jukunobegabe/idmKgeX/rough_country_speedometer_calibration_tool.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/a7074bd7-7d30-478c-93f8-ee0f492eb453/what_size_bobbins_do_brother_sewing_machines_use.pdfIn PDF document text
    • http://liwetagosozel.onlinewebshop.net/62322988443.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8adcc213-fd8b-4ef6-8876-d2214e2e8a6d/guguzomelaxuxuzarud.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1e032996-299c-4115-817d-e75c5da26c9a/what_is_a_ride_along_package.pdfIn PDF document text
    • http://ligoroxenafof.atwebpages.com/chick-fil-a_nutrition.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_off0001144c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1144C 5436 bytes
SHA-256: 3340ae304c20f89337897edf25342eeaa04b40af6a68d14fa3bbe77eed451703
font_01_sfnt_off000126c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126C6 11956 bytes
SHA-256: 922b1aafcbb7b7d827bdba0eb6709e0b8796202d0057c0bb24876bc6c8d0d72f