Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c66666e3c2ad17b…

MALICIOUS

PDF

75.5 KB Created: 2021-06-14 20:03:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bb98c064c053cb42f1cb2e873bc7de3a SHA-1: e3c86210453bfde27a682662cf506ff8773067f9 SHA-256: 8c66666e3c2ad17ba198692c9975fd2238e73dd73edd1a3ff3e402ee3b6d5f8d
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 of which point to disposable domains or link farms, indicating a phishing or malware distribution attempt. The heuristic 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggest this malicious intent. The ML classifier and ClamAV detection further confirm the malicious nature of the file. While no scripts were explicitly extracted, the presence of embedded URLs and the overall structure point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • 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.
  • 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
  • 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://nomylo.ru/pbw?utm_term=convert+cdr+to+jpg+free
    • https://zojezuma.weebly.com/uploads/1/3/1/3/131382028/3caf4.pdf
    • https://kudokazapa.weebly.com/uploads/1/3/1/4/131452939/6bc2f4c22fadb.pdf
    • https://jozitosada.weebly.com/uploads/1/3/4/3/134325699/816b337a4c98059.pdf
    • https://xivibivo.weebly.com/uploads/1/3/4/3/134353446/8a6e17dad5103dc.pdf
    • https://milanesove.weebly.com/uploads/1/3/1/3/131383497/9549561.pdf
    • https://juzuxadubibipa.weebly.com/uploads/1/3/4/6/134685448/dofatifogexavaj.pdf
    • https://juludonidodag.weebly.com/uploads/1/3/4/7/134706402/3a9d4.pdf
    • https://lefokanu.weebly.com/uploads/1/3/4/3/134377273/tiwoxupisuxemefono.pdf
    • https://pasadotofeb.weebly.com/uploads/1/3/1/4/131482919/dexawij.pdf
    • https://gajabalavira.weebly.com/uploads/1/3/5/3/135347595/5f00f3a1b.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/7629f0ba-8f05-469f-a3b7-47390f3cb421/90119614168.pdf
    • http://wojipag.pbworks.com/w/file/fetch/144679743/gabotajukeze.pdf
    • http://fisukafetif.pbworks.com/f/44716147396.pdf
    • http://zizojeza.pbworks.com/f/13795931299.pdf
    • http://lururefisu.pbworks.com/w/file/fetch/144560373/23923419787.pdf
    • http://xuruzinijub.pbworks.com/f/66383491253.pdf
    • http://negaboxa.pbworks.com/f/19596856657.pdf
    • http://rorazokazog.pbworks.com/w/file/fetch/144524118/chemical_bonding_notes_for_neet.pdf
    • http://pojaweku.pbworks.com/f/zifevoxopukavupimevo.pdf
    • https://uploads.strikinglycdn.com/files/f77c27f6-c003-4dab-b8d4-19a3b752de4e/gemize.pdf
    • http://zegakodas.pbworks.com/w/file/fetch/144664311/4596788925.pdf
    • http://lifelekufa.pbworks.com/w/file/fetch/144607266/vubis.pdf
    • http://pilujibos.pbworks.com/f/guvupedosoruduzenaza.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ebb1.bin
79a2557f4236d698c1c720c4bdce8c3412875ff01683a49269593c51ab1240da		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEBB1 4944 bytes
font_01_sfnt_off0000fca7.bin
937ff44aa2642139504d96f1fbe38f021d3fe6d3dbedcdee7f3040030cc0bd67		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFCA7 10456 bytes

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