Malicious PDF — malware analysis report

Static analysis result for SHA-256 79d34c1e4fae1040…

MALICIOUS

PDF

86.7 KB Created: 2021-03-24 11:17:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 299e591d15131928597fecac438cdf2c SHA-1: cb8f7ad2d7582b80e6429e6acd26e3bba1db4dbd SHA-256: 79d34c1e4fae10400dc13cc46f6a665999dd0d430adfc7220011143803608454
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, indicating it functions as a link farm. Heuristics suggest it's designed to direct users to potentially malicious or SEO-manipulated content hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://resalured.ru/wix?keyword=mzulft+aedrome+key PDF link annotation
    • https://visimekariluvog.weebly.com/uploads/1/3/1/4/131483525/315888.pdfIn PDF document text
    • http://xodaxedepapopox.mygamesonline.org/custer_died_for_your_sins_chapter_summaries.pdfIn PDF document text
    • https://sefovoridufu.weebly.com/uploads/1/3/1/4/131438839/balitanadodefi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450259/normal_600e937ab1be1.pdfIn PDF document text
    • https://ranemexamegen.weebly.com/uploads/1/3/4/4/134440137/limadap.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366319/normal_5fca12354850b.pdfIn PDF document text
    • http://poxumanavofeboz.scienceontheweb.net/philips_gogear_vibe_how_to_turn_on.pdfIn PDF document text
    • http://bitoxifa.sportsontheweb.net/ilustracion_botanica_helen_birch.pdfIn PDF document text
    • http://totaxusozavu.sportsontheweb.net/zibisafopupipuzimogo.pdfIn PDF document text
    • http://juborad.mywebcommunity.org/tijopafixot.pdfIn PDF document text
    • https://duzufeto.weebly.com/uploads/1/3/4/7/134734580/c7ef96391d431.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402250/normal_5fe2466406179.pdfIn PDF document text
    • http://xufuzema.sportsontheweb.net/25453286626.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412902/normal_603548dbd7acd.pdfIn PDF document text
    • http://gifagudilul.mypressonline.com/calculus_textbook_free.pdfIn PDF document text
    • http://bivoliku.mywebcommunity.org/adirondack_hiking_map.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://padusij.onlinewebshop.net/kutopasufegesixeguta.pdfIn PDF document text
    • https://s3.amazonaws.com/tugabijenovili/35565589886.pdfIn PDF document text
    • https://bc5ba30c-e427-49eb-abc4-9677f18f04c1.filesusr.com/ugd/bcd086_2324d2b7970e404ab93f67a0919b8703.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/ziwuvijevo/easy_vegetable_salad_recipes_for_weight_loss.pdfIn PDF document text
    • https://15319a82-8c66-4906-b3c2-464277991f2b.filesusr.com/ugd/070acf_098420bb81ab47bba16d763a7ae3c8d5.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kizugokofo/free_letter_f_coloring_sheet.pdfIn PDF document text
    • https://9c789f27-b70c-4c9d-9e83-211ee8f99b38.filesusr.com/ugd/bdeb4c_5679d97b5f8e4fcea281c837a7576532.pdf?index=trueIn PDF document text
    • https://cb38ef3f-1f2c-4622-8962-dca261660167.filesusr.com/ugd/3ae201_e47da5f57ec54d33a7539173d8d5df29.pdf?index=trueIn PDF document text
    • https://bdc3fad0-85dd-4e34-85f7-620d54d4ff6f.filesusr.com/ugd/10cedf_a25b276814714eaf89df8a1f219c34e3.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/rabewiruzitewa/64455168098.pdfIn PDF document text
    • http://padusij.onlinewebshop.net/oxford_advanced_dictionary_12th_edition.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010abf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ABF 4824 bytes
SHA-256: 2cb742ed19f3b3cc34fe572126cc49eb6f2a6db81641c447a97c3de8df518ef2
font_01_sfnt_off00011b48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B48 10472 bytes
SHA-256: 05fcdb1b1705e4d1ae725aa6637024563573bfac7b80955b4f4a8ed6d5d2636c
font_02_sfnt_off00013f01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F01 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3