Malicious PDF — malware analysis report

Static analysis result for SHA-256 7045f4918d0ce7df…

MALICIOUS

PDF

94.5 KB Created: 2021-04-19 11:42:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 307c4a6b1130b1b8c9f68d01086a4447 SHA-1: 9dfc8045f8a7a0421d6c61f1ca4783a60de6227e SHA-256: 7045f4918d0ce7df38903a3e139d65e0f9ba0cd650415a8f31ecf69be306dfe1
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, characteristic of a link farm. The document body, though partially corrupted, contains a search query related to sugar conversion, suggesting a lure to attract users. The presence of multiple external URIs and the ML classifier's high confidence score indicate a malicious intent, likely for SEO manipulation or distributing further payloads.

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://seumenha.ru/strik?utm_term=cuantos+mililitros+son+50+gramos+de+azucar PDF link annotation
    • http://jedilinosur.mywebcommunity.org/search_text_in_outlook.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454049/normal_605b789c5ee19.pdfIn PDF document text
    • http://pumutug.iblogger.org/anopheles_subpictus.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380073/normal_6060fada5ec60.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393889/normal_604d8acf44a48.pdfIn PDF document text
    • http://riwotivadejud.sportsontheweb.net/civil_construction_business_plan.pdfIn PDF document text
    • http://movawizaxaxato.mywebcommunity.org/92088718518.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403952/normal_6051ee9215025.pdfIn PDF document text
    • http://nenodipemuxok.mypressonline.com/atem_television_studio_setup_diagram.pdfIn PDF document text
    • http://kefudepoduwudi.sportsontheweb.net/36161522130.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479446/normal_604cccad32691.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://ragudoduwe.epizy.com/high_protein_flat_belly_diet_meal_plan.pdfIn PDF document text
    • http://lamekukibudinos.epizy.com/avery_5162_template_free.pdfIn PDF document text
    • https://5053e88e-9e18-4719-890c-32a1cca0295d.filesusr.com/ugd/411503_265bafc476f34404b8f8c1b07bd0e94b.pdf?index=trueIn PDF document text
    • https://ae26bae5-b1f3-4fb2-a0ba-5d2f2d23988c.filesusr.com/ugd/aec2ea_fcd818fc730246dabb1db518c6e82164.pdf?index=trueIn PDF document text
    • https://3b0fe5ff-7f86-489c-8138-fc984e51136c.filesusr.com/ugd/bfd78a_ff46332fe704436db6cebb049b76eda5.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/penale/kedomakitizaz.pdfIn PDF document text
    • https://s3.amazonaws.com/defipedibe/fofipizak.pdfIn PDF document text
    • http://sopexalibip.onlinewebshop.net/menace_d_accouchement_prmatur.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010c28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C28 5480 bytes
SHA-256: b67f0093d6947a9d7c887958ef439f4b8a416a827de4cca10544adf066280711
font_01_sfnt_off00011eb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EB9 12552 bytes
SHA-256: 422a076d514847dd7d35d86975fc2d265c95d3da79d62db1f56ccb981908533b
font_02_sfnt_off000147bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x147BD 16036 bytes
SHA-256: 35d3440dae1ebc896564e4e6f70ea95aa3a30a1ac603c7fffbb21b68b8b72e2f
font_03_sfnt_off00015c27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15C27 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34