Malicious PDF — malware analysis report

Static analysis result for SHA-256 34dc77f5beda94a4…

MALICIOUS

PDF

73.0 KB Created: 2021-05-20 22:45:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 83d204cd5d2e58510e686fe07b51ec1e SHA-1: e0a0dcfb09e839911cf8b47e47cdc8a6d6e5adf4 SHA-256: 34dc77f5beda94a4cb2ac0145f1e6abff6a49c87b65e1ded1c8e3387951f4ef1
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, suggesting a link farm or SEO poisoning tactic. The primary URL, 'https://botokaw.ru/strik?utm_term=modern+elementary+statistics+12th+edition+answers', appears to be a lure for academic content. While no scripts were explicitly extracted, the PDF structure and the presence of numerous external links strongly indicate a phishing or redirection attempt, likely to deliver a second-stage payload or lead users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://botokaw.ru/strik?utm_term=modern+elementary+statistics+12th+edition+answers PDF link annotation
    • https://karivimefoga.weebly.com/uploads/1/3/4/3/134311068/9892562.pdfIn PDF document text
    • https://vukujaxirebes.weebly.com/uploads/1/3/4/1/134108713/6d8d612.pdfIn PDF document text
    • https://buwotudotep.weebly.com/uploads/1/3/1/6/131606539/8300758.pdfIn PDF document text
    • https://fojexoduzasob.weebly.com/uploads/1/3/4/6/134693365/zufusopi_godunu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4503050/normal_5fe5d5aee6020.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369307/normal_5fdfd599518c4.pdfIn PDF document text
    • https://fitikelamo.weebly.com/uploads/1/3/4/6/134668278/d14e232ae2f6d.pdfIn PDF document text
    • https://pozesipo.weebly.com/uploads/1/3/5/3/135346015/1044651.pdfIn PDF document text
    • https://witetalujoloxof.weebly.com/uploads/1/3/0/7/130740434/lazabokiziz-rafisomi-vesejajuligafik-zenipapi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373986/normal_604e74f07eecc.pdfIn PDF document text
    • https://jefamozalubibul.weebly.com/uploads/1/3/1/4/131438275/406bd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421934/normal_5fe45552727d3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479933/normal_6013c4d4d9697.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387706/normal_5ff4c8769e065.pdfIn PDF document text
    • https://xomadugazulu.weebly.com/uploads/1/3/4/5/134597447/4992609.pdfIn PDF document text
    • https://tikofasej.weebly.com/uploads/1/3/4/6/134615027/dipel-pijutopil-mojalajuwamat.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453329/normal_602ac1c614de0.pdfIn PDF document text
    • https://vevumugenewasu.weebly.com/uploads/1/3/0/7/130776279/funebotivokik_bizepi_goboxudav.pdfIn PDF document text
    • https://bimuwalunamen.weebly.com/uploads/1/3/1/3/131384226/kusawikat_papup.pdfIn PDF document text
    • https://latebutaweba.weebly.com/uploads/1/3/4/3/134315799/ecfd73d.pdfIn PDF document text
    • https://gudivolopuna.weebly.com/uploads/1/3/5/3/135346868/kitifowo-fojanos.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000dcba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCBA 5564 bytes
SHA-256: 0648ece6e871db7f1f52543f56d976aaf57f2d878d9b69547ce5d9189c7e9bce
font_01_sfnt_off0000ef9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF9D 10900 bytes
SHA-256: dc40a5106087654719fe7ccc2d238f883344400e7078ea21fc3049b8c29bb44c