Malicious PDF — malware analysis report

Static analysis result for SHA-256 a909ae78e709a6fe…

MALICIOUS

PDF

66.4 KB Created: 2021-06-06 04:40:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 07a904224c8adc3135f0c3c95bd8bde6 SHA-1: 5149c5fd5a0ee4bea198ccac5287d14c8ef5c99b SHA-256: a909ae78e709a6feff9c08550b2685324e1fe6481dfeea25a34ec0a1d03ead1a
124 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The sample is a PDF document that contains numerous embedded URLs, many of which point to disposable hosting services. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a high likelihood of this document being used for link farming or phishing. The ML classifier and ClamAV detection further support its malicious nature. No scripts were extracted, but the primary attack pattern involves directing users to external, potentially malicious, websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9417

Heuristics 4

  • 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 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://krisoc.ru/pbw?utm_term=zero+and+first+conditional+practice+pdf PDF link annotation
    • https://dowamodugepaxa.weebly.com/uploads/1/3/0/7/130739159/a05eb46ca53.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388614/normal_60094b0b8aa2c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384149/normal_6064dac825f74.pdfIn PDF document text
    • https://fuvodaxe.weebly.com/uploads/1/3/1/3/131379021/wubarof.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386620/normal_5fc6824395d8b.pdfIn PDF document text
    • https://najutumivuzobo.weebly.com/uploads/1/3/4/4/134473994/forimazapanokezetime.pdfIn PDF document text
    • https://wivevesatowot.weebly.com/uploads/1/3/0/8/130813399/ferelisetar.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416927/normal_5fd7f6dab6003.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482218/normal_6064765ae9f25.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480382/normal_602b833126736.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474734/normal_6059b0fda9b47.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4443799/normal_5ff281a81887d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450640/normal_5febf57224e3a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470027/normal_602579f9bb615.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/76f7fe84-0bc7-426a-bfca-e4624ebaed58/kadixidoxebekik.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4739e4a4-8a23-4afb-b77e-78c4939fbec4/why_is_my_honda_accord_check_engine_light_on.pdfIn PDF document text
    • http://tagexoba.pbworks.com/w/file/fetch/144634794/weird_texas_laws_still_in_effect.pdfIn PDF document text
    • http://nilanom.pbworks.com/f/62152078654.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0d747aeb-737b-47d9-b7ec-771912eeb11b/how_to_lie_with_statistics_darrell_huff_summary.pdfIn PDF document text
    • http://jobojifitin.pbworks.com/f/lovelirerikuto.pdfIn PDF document text
    • http://vedufid.pbworks.com/w/file/fetch/144603537/what_does_inactive_fortnite_account_mean.pdfIn PDF document text
    • http://mutoteja.pbworks.com/w/file/fetch/144515712/32944414192.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/19167b82-1847-42b7-96ec-a052b9231339/what_are_the_three_branches_of_government_and_what_does_checks__balances_mean.pdfIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e576.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE576 5108 bytes
SHA-256: 590e4172316f7434e71af40cd83ac52bde477d501a9d1523eac17cdbf9046336

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