Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3081e119d9ddf5d…

MALICIOUS

PDF

78.0 KB Created: 2021-04-22 10:41:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: c479bdac44180140c15b1f5de4953fe2 SHA-1: 270899899034085096c648f1568e4153d52ad2e9 SHA-256: f3081e119d9ddf5d15bba829e055219fc78b41e57247fcced5692761c3a03bdf
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, a common tactic for distributing malware or conducting phishing campaigns. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external URIs suggest it's designed to redirect users to malicious sites, potentially leveraging embedded JavaScript for obfuscation or further redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://botokaw.ru/strik?utm_term=how+to+draw+anime+step+by+step+boy PDF link annotation
    • http://prizinsta365.online/xakixutofowegokow7sbx5.pdfIn PDF document text
    • https://bewepuxajijasi.weebly.com/uploads/1/3/4/3/134362307/5640534.pdfIn PDF document text
    • https://xefakiradu.weebly.com/uploads/1/3/1/8/131856624/rejoburakasilubonape.pdfIn PDF document text
    • http://makedctl.site/lutezctb8s.pdfIn PDF document text
    • https://vezafowifav.weebly.com/uploads/1/3/1/6/131637603/b713c41cd73850b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372702/normal_603e244909548.pdfIn PDF document text
    • https://pufakifitapota.weebly.com/uploads/1/3/4/5/134581323/gobafad.pdfIn PDF document text
    • https://vovikadu.weebly.com/uploads/1/3/4/5/134587732/7e5e13a3c975.pdfIn PDF document text
    • https://tiwibuvemugijaj.weebly.com/uploads/1/3/0/7/130776889/nisef_wadubategamato_defofewirek_dijorowaxa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405206/normal_604bacca70c6d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403274/normal_5fd8206744d49.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454289/normal_6014335699c7e.pdfIn PDF document text
    • http://dithetsen.xyz/toyota_camry_le_2014_mpgx3r07.pdfIn PDF document text
    • http://ig-copyrightnotice.com/64777434455wmkc8.pdfIn PDF document text
    • https://sutafosuteloxep.weebly.com/uploads/1/3/0/8/130814172/2819208.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/69a716f7-c931-4ce1-989b-5d10b2d7828f/navy_boot_camp_in_chicago_address.pdfIn PDF document text
    • http://jedabotuz.epizy.com/41620317968.pdfIn PDF document text
    • http://buladuwe.rf.gd/gunilevokitim.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a22cb17c-b332-475c-8d68-7c7300525bf7/how_do_you_use_a_pampered_chef_food_chopper.pdfIn PDF document text
    • http://jufomotapi.epizy.com/central_air_conditioning_systems.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/88a1b65e-c3a4-401d-b2ea-5129526af189/do_deer_move_at_night_without_moon.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4ec5c0c9-c527-4979-b1f4-2ec433dcf35a/38414318307.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_off0000f26e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF26E 5368 bytes
SHA-256: c88bf63c0279f0ffa0624e1f5c810119a9de42ed4e5644d2281de535954e6ff0
font_01_sfnt_off000104a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104A3 11436 bytes
SHA-256: 103d393b69deeb2f2cae3f40e03fa876c8fd8edc18dd986a6d7d6d1221b428e9