Malicious PDF — malware analysis report

Static analysis result for SHA-256 717503b72e42bbcd…

MALICIOUS

PDF

88.1 KB Created: 2021-03-24 11:45:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: ba1db41f294bb9db40831b72a688d2f8 SHA-1: e93c352730e6323069b88c9bdc39fd985e30af64 SHA-256: 717503b72e42bbcdf749528a91bfda414cd86298a3a45f0858d8122e663f16ca
186 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, contains text related to the expression 'hard as nails', likely a lure to direct users to malicious URLs such as fokemale.ru.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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=what+does+the+expression+hard+as+nails+mean PDF link annotation
    • http://dalosizofovabes.medianewsonline.com/ruzis.pdfIn PDF document text
    • http://jalakerag.22web.org/rekogufuzo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409417/normal_601cc01e116b3.pdfIn PDF document text
    • https://nipawivas.weebly.com/uploads/1/3/2/6/132680981/6460556.pdfIn PDF document text
    • http://sufawevugut.mywebcommunity.org/61451959431.pdfIn PDF document text
    • https://wupexuzirat.weebly.com/uploads/1/3/5/3/135338028/xawolisadaxejalemaw.pdfIn PDF document text
    • https://muzitotixigo.weebly.com/uploads/1/3/1/4/131407705/wanewarosefodo.pdfIn PDF document text
    • http://favunewesazut.sportsontheweb.net/98064314078.pdfIn PDF document text
    • https://jepejopik.weebly.com/uploads/1/3/4/6/134610321/xofegamet.pdfIn PDF document text
    • https://peziwotikiju.weebly.com/uploads/1/3/4/6/134602895/ebcb619145d444d.pdfIn PDF document text
    • https://balesiloruj.weebly.com/uploads/1/3/4/6/134671801/zizose-navagotezij-gadumagi-fodaforit.pdfIn PDF document text
    • https://zunezazawegor.weebly.com/uploads/1/3/4/6/134665047/c1ae38b6e405a6c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4394079/normal_601b1f890d9e7.pdfIn PDF document text
    • https://molapoji.weebly.com/uploads/1/3/4/0/134096941/6117355.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450724/normal_604dc3954e6dc.pdfIn PDF document text
    • https://pizotiwedif.weebly.com/uploads/1/3/4/8/134868845/xizanoreropigo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458633/normal_6010ea91778e2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gowejolu.rf.gd/49310189149.pdfIn PDF document text
    • http://labilugukaj.rf.gd/74682677332.pdfIn PDF document text
    • http://nejimafalun.onlinewebshop.net/85414837421.pdfIn PDF document text
    • http://bubewap.rf.gd/54495854467.pdfIn PDF document text
    • http://posijibanif.epizy.com/98147591219.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_off0000fb7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB7B 5280 bytes
SHA-256: 423b88d97ca23cbbe1f5b393222132a6309ca0a70d522c5f84b1b0b1a6b0528c
font_01_sfnt_off00010d52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D52 14736 bytes
SHA-256: 4ba91e23e8a2365d8626ed933d1e2fbe8020a62921cc2b4e7bebba2af1bdb05b
font_02_sfnt_off00013af4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AF4 16148 bytes
SHA-256: 43dd7310e986e37c0562d6efd2a67b6291a0d41fa892ecd43b306c3e7231f7b7