Malicious PDF — malware analysis report

Static analysis result for SHA-256 1731dc8e9313c6ff…

MALICIOUS

PDF

94.9 KB Created: 2021-04-06 21:59:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 77acd245d037df3d1e7054a104d2e13c SHA-1: b7927c87e74a5d651b22ffff855f8a04efc56ca8 SHA-256: 1731dc8e9313c6ff1eb43a01907dc32d1855c2532e835a2f6e51b4bd228f3fff
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV. It contains a large number of external links, many pointing to disposable domains, suggesting it is part of an SEO spam or phishing campaign. The document body, though heavily obfuscated, contains text related to 'Draw a person test interpretation' and metadata indicating it was generated by wkhtmltopdf, which can be used to create malicious PDFs. No scripts were extracted, but the presence of numerous external links indicates an attempt to redirect users to potentially harmful content.

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
  • 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://golowaki.ru/strik?utm_term=draw+a+person+test+interpretation PDF link annotation
    • http://roflan.site/13244379012yua06.pdfIn PDF document text
    • https://zugufanebuloko.weebly.com/uploads/1/3/4/0/134016669/6616924.pdfIn PDF document text
    • http://subejewumo.scienceontheweb.net/calcular_porcentaje_de_grasa_corporal_por_pliegues.pdfIn PDF document text
    • https://razisosip.weebly.com/uploads/1/3/0/7/130739291/nademo.pdfIn PDF document text
    • http://jemagekotudipuk.22web.org/what_is_the_chemical_formula_for_sea_water_joke.pdfIn PDF document text
    • http://wezejej.22web.org/moxizonudoregiru.pdfIn PDF document text
    • http://changepass.online/moksha_en_el_hinduismoxccjv.pdfIn PDF document text
    • http://rkconstructionsucks.com/tunatugomanoburamugugufw3onl.pdfIn PDF document text
    • https://kafunisizu.weebly.com/uploads/1/3/4/5/134599740/pomagezerodi_zadapu_lanikorisul_guvepiwepalexa.pdfIn PDF document text
    • http://yandex-delivery.cc/words_of_encouragement_for_new_parentsr1nwm.pdfIn PDF document text
    • https://vekatofe.weebly.com/uploads/1/3/0/7/130775682/munixezabo.pdfIn PDF document text
    • https://xinusikavafomi.weebly.com/uploads/1/3/4/3/134353784/miziketukukojesevox.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/554fd48e-d49f-4459-878b-80d556dc29d0/milwaukee_m18_battery_charger_problems.pdfIn PDF document text
    • http://vasakuzepilaxi.onlinewebshop.net/biografia_allan_kardec.pdfIn PDF document text
    • http://naxepedawizozet.onlinewebshop.net/95301486965.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d5c6e0a4-88b2-414d-b27f-929b616edbbe/bbc_radio_1_top_40_uk_singles_chart.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e73ae6bf-fcc1-4b9f-8b55-fc054943693b/35216658855.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9b1b87c9-d750-4aa6-bcf0-e445f397f9a9/zudusi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3cf3732b-2cf2-42cb-a883-574172f15ee3/cambridge_latin_course_unit_1_stage_12_translations.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b2a5cb04-3e30-4547-8813-e998575318dd/black_feminist_thought_chapter_5_summary.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fd9572aa-d034-4de4-8197-3475e9231ce5/23734339389.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e2fb5a3c-5f2b-48d1-8653-bc6dd5992a03/82324569762.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_off000137e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137E2 4872 bytes
SHA-256: 23c7dc10b5ec124f85317df0e1d38dd423cbccc7e1348f9b270c61b2190036a1
font_01_sfnt_off00014898.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14898 11100 bytes
SHA-256: 94a4187a469d2cfe94289e509f88ba4ce12b131db7ecfd2cc52679c9d4d1402a