Malicious PDF — malware analysis report

Static analysis result for SHA-256 50c6f926920ba1a3…

MALICIOUS

PDF

75.9 KB Created: 2021-03-17 02:47:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 9983c43c56801c9eb833b1aa235610ca SHA-1: fca7b52e4503d1c736911074210e4d263c6315dc SHA-256: 50c6f926920ba1a37dbda96896749e93e31f3a5c0f0a0397a78a77b9352cc0af
186 Risk Score

Malware Insights

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

The PDF file contains a heuristic firing for PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM, indicating it is part of a link farm designed to redirect users. The embedded URL https://seumenha.ru/strik?utm_term=how+to+remove+back+of+timex+watch+to+replace+battery suggests a lure to disguise the malicious intent. ClamAV also detected this file as Pdf.Phishing.Trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://seumenha.ru/strik?utm_term=how+to+remove+back+of+timex+watch+to+replace+battery PDF link annotation
    • https://pobapuzelikawe.weebly.com/uploads/1/3/0/7/130739661/bfc1cb4621dd.pdfIn PDF document text
    • https://zuxizakubapepo.weebly.com/uploads/1/3/4/3/134317428/jekapu.pdfIn PDF document text
    • https://bosazafaxaku.weebly.com/uploads/1/3/1/3/131383721/bebemifujaku.pdfIn PDF document text
    • http://gopadaxin.mywebcommunity.org/lefixawuxujiwebi.pdfIn PDF document text
    • https://wefidabewurar.weebly.com/uploads/1/3/1/1/131164485/zitejusodaperuru.pdfIn PDF document text
    • https://tukobigerokigab.weebly.com/uploads/1/3/4/6/134653943/fulak.pdfIn PDF document text
    • http://raxejudesezix.scienceontheweb.net/grade_7_maths_exam_papers_south_africa.pdfIn PDF document text
    • https://ninujesifig.weebly.com/uploads/1/3/1/4/131453022/e41de7f2.pdfIn PDF document text
    • https://fodigedij.weebly.com/uploads/1/3/2/7/132740281/2580544.pdfIn PDF document text
    • https://wutomafokusax.weebly.com/uploads/1/3/5/3/135314756/202094c4.pdfIn PDF document text
    • http://lorinov.22web.org/empirical_methods_in_finance.pdfIn PDF document text
    • https://zasosefudasu.weebly.com/uploads/1/3/1/8/131856937/lonoj.pdfIn PDF document text
    • http://fuxokubatasiju.22web.org/88298633932.pdfIn PDF document text
    • https://vakogupomuniv.weebly.com/uploads/1/3/4/6/134610568/6626380.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://0c2a7d7b-be9d-4ef2-a94c-09ca905cc17d.filesusr.com/ugd/7d21c0_a8b00bdcc43e48eda3e8da4a168b909d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dutuzanob/42295901818.pdfIn PDF document text
    • https://s3.amazonaws.com/sojenozap/47480672256.pdfIn PDF document text
    • https://d3df31c7-72fe-42b1-a92e-0723e8ed7a16.filesusr.com/ugd/5bf82b_b1dac99bf07541aca7d953ac9055cdfa.pdf?index=trueIn PDF document text
    • https://11ab4cf5-156d-4417-99e9-5039b2a7eb5f.filesusr.com/ugd/82d61e_e7bd62a76ebf436fa64d6bfcf8ee94ae.pdf?index=trueIn PDF document text
    • http://timagilo.epizy.com/by_the_skin_of_your_teeth_bengali_meaning.pdfIn PDF document text
    • https://dec4a425-646e-450a-80ca-a73a75d058ad.filesusr.com/ugd/ba3095_f27090640bd5404da21fee89e262edc1.pdf?index=trueIn PDF document text
    • http://zatuvejamubolo.atwebpages.com/avatar_korra_comics_read_online.pdfIn PDF document text
    • http://gukimag.rf.gd/gizigonojawukuvowusaz.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_off0000e8e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8E9 5564 bytes
SHA-256: b6d9b361e60d7ec2be344a8d73f811bbe96555c1b4e279be6d4a466c450b5cb9
font_01_sfnt_off0000fbca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBCA 10628 bytes
SHA-256: 1ebf8559d34943f8f0b575a2a37c2509470cff81d3f67d3fa18eb0c4ef66e8c2