Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd8d27ee3f4cc042…

MALICIOUS

PDF

78.0 KB Created: 2021-02-25 22:17:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 55dced1276673082a820ed481511df34 SHA-1: 9d907632e1ecc59c2ba8aeb4ea3c49e8d8c326c9 SHA-256: fd8d27ee3f4cc042758a5c47a1fab02a1db433f4f262fe5ce47dc8f228c920e8
186 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO spam operation. One of the embedded URLs, 'https://maypoin.ru/wb?keyword=evaluating%20trig%20functions%20unit%20circle%20worksheet', suggests a lure related to educational content. Although no scripts were explicitly extracted, the PDF structure and extensive link farm are indicative of malicious intent, likely for phishing or driving traffic to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://maypoin.ru/wb?keyword=evaluating%20trig%20functions%20unit%20circle%20worksheet PDF link annotation
    • https://zozetaxurumel.weebly.com/uploads/1/3/4/5/134590082/pomonakij_wowimevaz_getosuk.pdfIn PDF document text
    • https://xuvurabog.weebly.com/uploads/1/3/2/6/132696285/kufep_gezakobosadopa_vobejakitologo.pdfIn PDF document text
    • https://puzejiwitamino.weebly.com/uploads/1/3/1/4/131453698/dakomivelununi.pdfIn PDF document text
    • https://janirakuvofubej.weebly.com/uploads/1/3/4/7/134734148/wofesi.pdfIn PDF document text
    • https://kadibunafi.weebly.com/uploads/1/3/0/9/130969561/negizisobikanu.pdfIn PDF document text
    • https://lemamoramu.weebly.com/uploads/1/3/5/3/135348447/1c2ed6717714657.pdfIn PDF document text
    • https://rujupiben.weebly.com/uploads/1/3/4/8/134852491/rozufimeperobavugiv.pdfIn PDF document text
    • https://mavabebuvaxar.weebly.com/uploads/1/3/0/8/130814237/bifixere.pdfIn PDF document text
    • https://cdn.sqhk.co/widexerun/1giFZhe/wavetabelobewiximuz.pdfIn PDF document text
    • https://mopebewugo.weebly.com/uploads/1/3/0/7/130776026/dikavopoduxibo_rejejid.pdfIn PDF document text
    • https://cdn.sqhk.co/putuziboki/pWUW3gj/annoying_cookies_vs_claus_game.pdfIn PDF document text
    • https://cdn.sqhk.co/tazewupo/iaPxqj1/archery_bow_press_canada.pdfIn PDF document text
    • https://zulazuxalumino.weebly.com/uploads/1/3/1/6/131606396/1196024.pdfIn PDF document text
    • https://cdn.sqhk.co/golizojuw/jigfmge/voxomejag.pdfIn PDF document text
    • https://sapilijufidukuw.weebly.com/uploads/1/3/4/9/134901451/rumakepafekel.pdfIn PDF document text
    • https://bolojowugupi.weebly.com/uploads/1/3/4/8/134886087/puninoripoxel.pdfIn PDF document text
    • https://nuxirudeduw.weebly.com/uploads/1/3/4/4/134442083/naneb.pdfIn PDF document text
    • https://zelekunidos.weebly.com/uploads/1/3/2/6/132682808/todenus.pdfIn PDF document text
    • https://fevuxutub.weebly.com/uploads/1/3/4/1/134131759/kokat-fujaxo.pdfIn PDF document text
    • https://denelabi.weebly.com/uploads/1/3/4/1/134109088/mabusogeze.pdfIn PDF document text
    • https://wifajeru.weebly.com/uploads/1/3/4/3/134342489/7f07f76e8.pdfIn PDF document text
    • https://nodifolosorak.weebly.com/uploads/1/3/4/7/134758422/firuka-gemejaxezopesab-pokewefowanesef.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e92a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE92A 2960 bytes
SHA-256: 4253ce374f546ed82c0b962bfad5e193173c5af7311640f7068ccdda2cb38311
font_01_sfnt_off0000f3ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3AB 5316 bytes
SHA-256: 1143cc9de78253ea59dd4f21c6fd943eda0ae5bf35e79e83e461f89212a6cede
font_02_sfnt_off000105da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105DA 10512 bytes
SHA-256: fe822482f6632869ad35edb93a2e6b23ffd6b9ab808bd32462d54b162e2d8e6c