Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f1a3b817febe48f…

MALICIOUS

PDF

78.0 KB Created: 2021-06-10 02:47:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: df6690548bdb60472657ec3be6bf77a2 SHA-1: ca52c4f12149d7b4805ae36c77544ffcec04ef56 SHA-256: 6f1a3b817febe48f11cbec114ac5b6ad99deb7a91417e4a7d41148654714c455
186 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, and it contains numerous external links. Several heuristics indicate it functions as a link farm, with many links pointing to disposable hosting and potentially malicious domains. The presence of embedded URLs and the overall structure suggest an attempt to lure users to external sites, which is a common tactic for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://wastran.ru/pbw?utm_term=kimcy929+secret+video+recorder PDF link annotation
    • https://zegadakupoxak.weebly.com/uploads/1/3/4/7/134749069/4423498.pdfIn PDF document text
    • https://pusetuliv.weebly.com/uploads/1/3/1/6/131607438/vojifer_lejijajabuzijax_magam_kekarasas.pdfIn PDF document text
    • https://safanopoxave.weebly.com/uploads/1/3/4/4/134461162/fifuzalo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366331/normal_60369694aabea.pdfIn PDF document text
    • https://moworanapubo.weebly.com/uploads/1/3/4/6/134685821/6126b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495039/normal_602d0b808f268.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386091/normal_60109e7e9af0e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4491925/normal_5ff97a7070b6c.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/ebba102b-3512-4ca4-8480-621cb918ac19/homedics_total_comfort_ultrasonic_humidifier_warm__cool_mist_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/feea9d50-9e1f-4d83-a3a7-7f8eb0cd2663/90171190748.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/37886433-34ac-4403-bd11-bb33bbdffc2f/lexus_2020_nx_300_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/419738a9-e416-46ee-89ca-a10ba99422f8/writing_better_sentences_worksheets.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a0c09593-cf59-468e-ba30-18bfd10b9714/best_wordpress_templates_for_small_business.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/75951ed2-94ec-44ed-922c-f748d7e7317d/tibadevufesulu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2fd6e34d-48a8-45e3-9b91-0faee5445a9e/32458555402.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d5971733-65d5-4c37-ae54-741654811e06/21139085622.pdfIn PDF document text
    • http://negovijalulu.pbworks.com/f/new_daddy_gay_videos.pdfIn PDF document text
    • http://sorawako.pbworks.com/w/file/fetch/144477654/zowujufagawa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bc70b665-fd69-43eb-817e-bd0a7bb3078f/how_to_wire_a_honeywell_thermostat_t6360.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ef48dc09-5853-473d-8484-d12222202c75/tarot_card_meanings_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1aee6180-6b28-4bf8-be38-9ff5202cf172/best_english_language_grammar_book.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dcc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCC8 5260 bytes
SHA-256: 711a4a26d3806377b828ca186d5cf6790afc52736848edaaf37305cfe13a60c8
font_01_sfnt_off0000eeab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEAB 11652 bytes
SHA-256: 2cb124715d3592768db770c87c153ff3b6e73f37633469273615bb321483e0b1
font_02_sfnt_off00011592.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11592 16092 bytes
SHA-256: e9fe716c2abc985b12a899a49d5539e4e8be1b56d50c083b30290d85a2a7c848

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