Malicious PDF — malware analysis report

Static analysis result for SHA-256 5958693fc4a87f05…

MALICIOUS

PDF

78.7 KB Created: 2021-05-17 11:05:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: b4e42ffb4a049fc696968965fcbfad9e SHA-1: e4b7b4bbb8b210fe9742320ebc0a123e5dee505e SHA-256: 5958693fc4a87f05a49120cccbbfaea886218b1d5b5b0954fd2c57aae13aac67
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, indicating a link farm or phishing operation. The document body, though heavily obfuscated, suggests a lure related to a 'Dell 7010 power supply upgrade'. The presence of PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM heuristics, along with ClamAV detection as Pdf.Phishing.Trojan, strongly suggests malicious intent. No scripts were extracted, but the overall structure points to a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://fokemale.ru/strik?utm_term=dell+7010+power+supply+upgrade PDF link annotation
    • https://nilanifuk.weebly.com/uploads/1/3/5/3/135322299/mujenulopogomafiw.pdfIn PDF document text
    • https://mokizafot.weebly.com/uploads/1/3/5/3/135347773/4586667.pdfIn PDF document text
    • https://tozupefiga.weebly.com/uploads/1/3/4/2/134265365/toresuzopujasawusi.pdfIn PDF document text
    • https://vaseviga.weebly.com/uploads/1/3/3/9/133986607/wefegetagukezujan.pdfIn PDF document text
    • https://jexafowasefuxuv.weebly.com/uploads/1/3/4/5/134588667/pabezumap.pdfIn PDF document text
    • https://mepogazab.weebly.com/uploads/1/3/4/5/134501519/dagofipisowakod.pdfIn PDF document text
    • https://lopadedabebaf.weebly.com/uploads/1/3/4/8/134897987/kogetakerawabu_ferovewebuvoxi_jasin.pdfIn PDF document text
    • https://ketafimevudo.weebly.com/uploads/1/3/1/6/131637081/bd9d1ad7b2e.pdfIn PDF document text
    • https://tabekemaw.weebly.com/uploads/1/3/0/8/130874329/xumomu-zilulu.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/b052ff62-cfaa-46e5-8011-f53830bde0db/canon_eos_rebel_t5i_charger.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d0a55ff8-6121-4c13-88d6-97ff3a082e5c/gulmohar_english_book_class_8_download_2020.pdfIn PDF document text
    • https://9b56c271-8e60-4ff0-96d1-8930f8c082f8.filesusr.com/ugd/5a1ab0_b39e453fcb7149629ad178ef96962f5b.pdf?index=trueIn PDF document text
    • https://8319d365-0190-44ee-b2f3-e76f6fd230eb.filesusr.com/ugd/112488_1d912c7e0af545c5aee4da569c3db36e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/4e2f6adb-47c2-4f08-bd15-168d1b729d92/how_much_toto_toilet_cost.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2b75ade4-d60b-4bb2-abf1-18f812278fc8/jodusufakurikakodorevali.pdfIn PDF document text
    • https://6acf0ca1-aa41-4771-8b91-54baff69ee7f.filesusr.com/ugd/7d1dc9_717bbc467926401a82d192192984c309.pdf?index=trueIn PDF document text
    • https://cf336f9a-6a79-4542-9269-5b62d6eb69dd.filesusr.com/ugd/1daf83_f8bef4d70b1c420086fe0cc1e122dfde.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a1a7d3c8-dd6e-4be8-a3af-42bbecea38a0/question_behind_the_question_meaning.pdfIn PDF document text
    • https://275320ff-96dd-455a-9699-a0fdc58b27a5.filesusr.com/ugd/943725_53f48c19f391477d96f57608f1b4b94b.pdf?index=trueIn PDF document text
    • https://c7fb3737-a2fb-4e06-b71d-f78b648bb0a4.filesusr.com/ugd/a9248e_aa2ccff56561422095151363061fc651.pdf?index=trueIn 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_off0000f4a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4A3 5596 bytes
SHA-256: cbde0b43dce5b437ee102b02bd82c2027a94562e0c69c5b387f8c6e3deaed0b3
font_01_sfnt_off000107eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107EB 11664 bytes
SHA-256: a9b0b6d30a87a1d1b4239aafa9b0300b68ae8cb6e2bd264ab8e5f9a74f6a2541