Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0f4a91132118ac7…

MALICIOUS

PDF

83.8 KB Created: 2021-04-22 14:02:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 64a35042f40229d836c7296c03f1831a SHA-1: 88feb721794cea62acb2b67ddba3e08b3b9605a2 SHA-256: b0f4a91132118ac7d3a9f7596a2710f073939c92575b844b9e37c2a76151da64
244 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to disposable domains and redirector infrastructure, indicating a link farm designed for malicious purposes. One critical heuristic identified a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains text related to legal consultation, suggesting a phishing or social engineering lure. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://yafferge.ru/strik?utm_term=utah+criminal+attorney+free+consultation In PDF document text
    • http://verefdliyvtorogo.xyz/can_you_use_beats_studio_3_wireless_with_android2kol8.pdfIn PDF document text
    • http://tejasatobes.medianewsonline.com/exercises_after_total_knee_replacement.pdfIn PDF document text
    • http://juwupexutaval.mywebcommunity.org/aptitude_questions_and_answers_for_campus_placements.pdfIn PDF document text
    • http://pewodebepefawi.scienceontheweb.net/19632146444.pdfIn PDF document text
    • http://arnautmebel.ru/dating_simulator_ariane_guidee7e1k.pdfIn PDF document text
    • http://brightshopbg.xyz/6_month_computer_hardware_course_syllabusdpl0l.pdfIn PDF document text
    • http://orehi-siberian-force.online/free_download_crochet_patterns_for_beginners0r0y0.pdfIn PDF document text
    • http://kojazunupetip.mygamesonline.org/which_wings_of_fire_dragon_hybrid_are_you.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wugetad.myartsonline.com/adobe_reader_app_download.pdfIn PDF document text
    • http://sulorowanutabu.atwebpages.com/reservorios_biomagnetismo.pdfIn PDF document text
    • https://d064ede3-316f-4d13-8ec5-014b2136b3bd.filesusr.com/ugd/154db6_e54fabca8bae4dac8df8fb5adb6bbc43.pdf?index=trueIn PDF document text
    • https://be56f97b-0727-4a8e-a141-4155b83e75ac.filesusr.com/ugd/5034d0_234e8501406a4152a481edb2fdd7d24f.pdf?index=trueIn PDF document text
    • https://d321836a-1bf8-47c4-b4d3-67fe1e7f0250.filesusr.com/ugd/33ab24_a5e0cd1f4fcd4e5b81d1ab56fc070a53.pdf?index=trueIn PDF document text
    • https://f039f7e9-c7fa-441d-bf3d-2f0e35d6be10.filesusr.com/ugd/80685d_de688d5388de4a328b0c237c1685fd89.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/loneminovu/4k_live_tv_channels_apk.pdfIn PDF document text
    • http://niwimugosaz.onlinewebshop.net/tavutozisefab.pdfIn PDF document text
    • https://s3.amazonaws.com/lijopavexanuse/ragepajexafi.pdfIn PDF document text
    • https://77047a80-9f17-4504-a563-a097c25ca12e.filesusr.com/ugd/5c8b2f_9192976d083448bab0e6af4cc746a4c9.pdf?index=trueIn PDF document text
    • http://muluwokixo.onlinewebshop.net/free_download_english_to_sindhi_dictionary.pdfIn PDF document text
    • https://69f6cc44-9198-4e41-bafa-43503dba92bf.filesusr.com/ugd/dec231_a9bd9f4d0ac64c6a93d68c77720ea495.pdf?index=trueIn PDF document text
    • https://2f8a6ab9-e864-4757-b083-6627a13f4c48.filesusr.com/ugd/405339_b5ccf9896b774dada9125f0b6292de79.pdf?index=trueIn PDF document text
    • https://e4fb9bf1-a3d6-4767-9bf2-2a1021e5dc09.filesusr.com/ugd/53cfc7_6e01ac1d469d43b58101f0c98700f6d1.pdf?index=trueIn 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_off00010a70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A70 5212 bytes
SHA-256: 4ee02793ca4c7d2e5ab2aa5131ce19162ab4e5f41b2a9689f2000b3ebfe7f01d
font_01_sfnt_off00011c12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C12 10992 bytes
SHA-256: 8cfcc018710deea3ff6c7bd5e062f106be86ae70f7692bd33337fa936125a3b2

Open this report in the interactive analyzer, or submit your own file for analysis.