Malicious PDF — malware analysis report

Static analysis result for SHA-256 7eb6dca2e6295415…

MALICIOUS

PDF

75.3 KB Created: 2021-06-07 06:00:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: fff48ea4fa88c91eb816cedc89cff024 SHA-1: 59fbc22e93251b679ddef4992b09d313ce767c1c SHA-256: 7eb6dca2e62954159641b8f2b920a2d0fc2f05d88deb1bf8a13d7ccbddca95de
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document is classified as malicious, exhibiting characteristics of a link farm designed to redirect users to external websites. The document contains a significant number of embedded URLs, with one prominent URL leading to a site that appears to be a lure for typing games, but also contains a large number of other external links. The heuristic 'PDF_SEO_LINK_FARM' indicates a mass of external PDF links, and 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests these links are hosted on disposable infrastructure, increasing the likelihood of malicious intent. The ML classifier and ClamAV detection further support the malicious verdict.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://synerhu.ru/pbw?utm_term=juegos+de+mecanografia+gratis+para+principiantes PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4393488/normal_5fd937e3c0f0b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401540/normal_6023c8e50b004.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423750/normal_606768990f8aa.pdfIn PDF document text
    • https://sofofiwolasaxu.weebly.com/uploads/1/3/1/8/131856039/369ae6285f9.pdfIn PDF document text
    • https://wusukinepazewa.weebly.com/uploads/1/3/4/3/134372908/5767372.pdfIn PDF document text
    • https://redewude.weebly.com/uploads/1/3/1/3/131379671/658312207.pdfIn PDF document text
    • https://zufuleruzu.weebly.com/uploads/1/3/1/6/131637307/9603178.pdfIn PDF document text
    • https://pamibatofenowa.weebly.com/uploads/1/3/4/5/134525539/jolisibofazuvat.pdfIn PDF document text
    • https://waronovubuwige.weebly.com/uploads/1/3/4/6/134631102/xolalezoropulew_guremamizagosu_dodavilebeka.pdfIn PDF document text
    • https://suzoniku.weebly.com/uploads/1/3/4/4/134456843/powugojaliremiso.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367617/normal_605c6da8d25cf.pdfIn PDF document text
    • https://xavidupi.weebly.com/uploads/1/3/4/7/134723560/607aad1baf7.pdfIn PDF document text
    • https://xozuvopirabupo.weebly.com/uploads/1/3/4/5/134599715/xilukugilito-xorururiw.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4488804/normal_5fed42b39d393.pdfIn PDF document text
    • https://jopalezaleloloj.weebly.com/uploads/1/3/1/3/131380469/2af2ccc6e0.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/8a160523-f886-4fbe-b93f-4313eb790086/literary_term_for_exaggeration.pdfIn PDF document text
    • http://doxawadar.pbworks.com/w/file/fetch/144565308/jetelane.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4cfde4be-0ed7-4719-a956-091f604792f7/belogerinuvowowiz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/10e21ba4-8a95-4c73-8a85-3803185d11b0/ue_boom_speaker_sync.pdfIn PDF document text
    • http://xetibubib.pbworks.com/w/file/fetch/144411810/astrologa_y_numerologia.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dd44668b-e358-432b-9ddc-8280b215e82a/67588275658.pdfIn PDF document text
    • http://nolumemonip.pbworks.com/f/betternet_vpn_premium_v4.8.1_cracked_apk.pdfIn PDF document text
    • http://giresizuloki.pbworks.com/f/nexovifitepaped.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e2fc7163-96ea-4e54-a1e4-8d4c58bb72b3/sepoguzuzudalusepurafe.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_off0000e6a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6A4 5432 bytes
SHA-256: 26e96b8209597f858cdc3eb225bd90a9ad35cc66edf62642e46575c7ee008de6
font_01_sfnt_off0000f908.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF908 11128 bytes
SHA-256: c6c08e9a21588442d5260c83901b898c657e64b6f841f1e3d4f61a8062030693

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