Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f7820dbdb4f5cd2…

MALICIOUS

PDF

74.3 KB Created: 2021-03-31 19:41:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 68112aab69e0c67ca9ecda96cbb987ea SHA-1: e9582141806f94bffbb900b114b495c8e0c3a69c SHA-256: 5f7820dbdb4f5cd2617b9f77bcf29b5eab3053a52ffa80a3d08ed9fe7831f910
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The document contains embedded URLs, with one prominent URL pointing to 'vilenefex.ru' which is associated with a search query for 'honkai impact 3 apk offline', suggesting a lure to a potentially malicious site. The PDF's structure and the presence of numerous external links on disposable hosting further support its role as a malicious document, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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 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://vilenefex.ru/wix?keyword=honkai+impact+3+apk+offline PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4379491/normal_5fe3acffdb2fb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418984/normal_6008b19162a55.pdfIn PDF document text
    • http://boraguw.medianewsonline.com/44127699023.pdfIn PDF document text
    • http://speak4pro.com/zuvitolokadarifusovafe6rm1.pdfIn PDF document text
    • http://zesenadozefut.sportsontheweb.net/37219455994.pdfIn PDF document text
    • http://connexion-amelii.xyz/how_to_get_certified_in_coding_languages7v7iw.pdfIn PDF document text
    • http://zesaguzijor.mypressonline.com/86409610164.pdfIn PDF document text
    • http://malespw.xyz/john_deere_310a_backhoe_manualdahnb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381544/normal_5fd6acdb41bca.pdfIn PDF document text
    • http://wigosixozem.mywebcommunity.org/ownership_structure_definition.pdfIn PDF document text
    • http://womovenum.sportsontheweb.net/stress_management_journal_articles.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/jejulurowev/batata_vada_recipe_in_marathi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f7c9756a-4a95-489b-9137-f77891491dd4/58992877752.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/71f6d398-c43d-4658-872c-d23c7bb6dcd6/introduction_to_machine_learning_with_python_download.pdfIn PDF document text
    • https://s3.amazonaws.com/nuruvapozixix/tp-link_wpa4220_av500_powerline_wifi_extender.pdfIn PDF document text
    • http://rimadijek.rf.gd/25348442186.pdfIn PDF document text
    • http://vafotuneg.rf.gd/puximojoronimelojufi.pdfIn PDF document text
    • http://zezajezo.epizy.com/nccn_guidelines_lynch_syndrome_2018.pdfIn PDF document text
    • http://sisejarozig.epizy.com/98187994007.pdfIn PDF document text
    • http://wanalatuzukogax.epizy.com/raketezenuviwadinifip.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/00c8ec5c-aa84-4254-92dc-9d41d4c39f30/delta_miter_saw_stand_36-267_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/18bf91c3-b027-4ea0-93c8-c466157eed6e/xoluwukovivawugovabewug.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_off0000e2cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2CF 5076 bytes
SHA-256: 170e3b48c2a9e9679bbe1c9467cb0a2727f51128a987384fd14f258bf2b8d847
font_01_sfnt_off0000f40f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF40F 11496 bytes
SHA-256: 4d0fe6864d59ffe8d765e4a2b72cf1cfacdd7516ea77c0117303ee0f70558bd9