Malicious PDF — malware analysis report

Static analysis result for SHA-256 c10800476c819c82…

MALICIOUS

PDF

70.7 KB Created: 2021-06-06 23:53:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 753275fe99ca107fbbc4792deec6aa18 SHA-1: b0f613ef9110389e1c4083f072e1df381f7abd54 SHA-256: c10800476c819c82ee672d654400dbaa00735e925f8f15179055340b9f048591
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a large number of external links, many of which are hosted on disposable domains, suggesting a link farm designed to manipulate search engine results. The primary external URI points to a URL with a 'utm_term' parameter, further indicating a phishing or SEO manipulation attempt. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8225

Heuristics 5

  • 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
  • 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://ketchas.ru/pbw?utm_term=journal+ledger+and+trial+balance+questions+and+answers+pdf PDF link annotation
    • https://samomalekadoj.weebly.com/uploads/1/3/1/4/131438786/69240cd.pdfIn PDF document text
    • https://mavixozumag.weebly.com/uploads/1/3/4/8/134891478/5715794.pdfIn PDF document text
    • https://dobibumalo.weebly.com/uploads/1/3/1/0/131070161/1467151.pdfIn PDF document text
    • https://pakujefaf.weebly.com/uploads/1/3/0/7/130740244/nirusowixurudib-ronusimobalepib-vezapuvujiweru-waxifaxotefa.pdfIn PDF document text
    • https://disesusobabetom.weebly.com/uploads/1/3/0/8/130814900/nevopasaxadu.pdfIn PDF document text
    • https://nekitunanozot.weebly.com/uploads/1/3/5/3/135346928/vekojonogirifalas.pdfIn PDF document text
    • https://ziwevanefenej.weebly.com/uploads/1/3/4/5/134591483/1217924.pdfIn PDF document text
    • https://nakigere.weebly.com/uploads/1/3/4/6/134608851/kezipomozom-wukar.pdfIn PDF document text
    • https://xetomulezaze.weebly.com/uploads/1/3/0/9/130969551/5004368.pdfIn PDF document text
    • https://tusutaxuwipafu.weebly.com/uploads/1/3/4/4/134403355/kexuvedobumosegib.pdfIn PDF document text
    • https://bazafegaxu.weebly.com/uploads/1/3/1/3/131383427/9172714.pdfIn PDF document text
    • https://vekukexulijoj.weebly.com/uploads/1/3/4/3/134397774/dc7c1f0fcaa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/c06bb6f2-f395-4cf0-bfff-ea88fa74b793/8249032814.pdfIn PDF document text
    • http://zopujoxobug.pbworks.com/w/file/fetch/144411420/72258990565.pdfIn PDF document text
    • http://jizakatum.pbworks.com/f/fitidikizonut.pdfIn PDF document text
    • http://mapijakemifo.pbworks.com/w/file/fetch/144433281/vazemajumit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c724215d-392f-4383-8007-2aa7a8a6b8e0/muluzuruwi.pdfIn PDF document text
    • http://wusajigi.pbworks.com/f/dazem.pdfIn PDF document text
    • http://gemometis.pbworks.com/w/file/fetch/144520962/ikm_programmer_aptitude_test.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/13dc19fb-7323-4282-98ee-3da11d541fb4/how_to_search_in_google_classroom_in_mobile.pdfIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e729.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE729 5672 bytes
SHA-256: 06a7492da5793fb5c96181add2edef41ed2a73fb0f52b9ab212a307a324fc807
font_01_sfnt_off0000fa8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA8F 10904 bytes
SHA-256: 7708c893b4d204c538b8fe0f1b065380b023cb8de2460e435b9920968ba8bd00

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