Malicious PDF — malware analysis report

Static analysis result for SHA-256 0cb276f3a4c39963…

MALICIOUS

PDF

78.1 KB Created: 2021-03-14 01:20:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d49a2d3c19b085f4f5b76494ce98d4ef SHA-1: 703b24ffd51e5efc2f53d7c41d1b6e6e6143438a SHA-256: 0cb276f3a4c399639fe9fb87f76f773dcbae7ec72c5a17fb7ebf1657f9604362
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, many of which point to external PDF files hosted on various domains, suggesting a link farm or redirection scheme. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were directly extracted, the PDF structure and embedded URIs are indicative of a malicious document designed to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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
  • 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://ponafet.ru/123?utm_term=android+studio+installation+windows+7+32+bit
    • https://segalupozido.weebly.com/uploads/1/3/0/7/130738693/ladodiwalamewe.pdf
    • https://gasuzenop.weebly.com/uploads/1/3/4/2/134266144/bupiderofom-luzujufasa-fewizalero-xekuranimili.pdf
    • http://xuduxuv.iblogger.org/43946476189.pdf
    • https://cdn.sqhk.co/nakizenonetu/eM4jaSM/48869040379.pdf
    • https://cdn.sqhk.co/wobivada/ifjbmhf/tuwumanotisotowarotodes.pdf
    • https://cdn.sqhk.co/vigibizez/e0Ugcii/78130721977.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/mujesogi/learn_french_by_podcast_free.pdf
    • https://s3.amazonaws.com/begijufadi/xitugakapejififisejefa.pdf
    • http://wudunerizipite.epizy.com/89308769322.pdf
    • https://s3.amazonaws.com/mejifavo/rufegurarasakewawiz.pdf
    • https://s3.amazonaws.com/bovenotojitowe/tejazefejimu.pdf
    • https://s3.amazonaws.com/vutame/46166310951.pdf
    • https://30c74dc1-c3f2-4e71-8253-1ec84f3b94e1.filesusr.com/ugd/b8c6fa_407293f0938244aba533ee68530865e2.pdf?index=true
    • https://cd70d4e5-4a1a-4071-96d1-f2415ea5ece1.filesusr.com/ugd/7f46b5_bf7451ddfa5b492f82e8d47e5baa7668.pdf?index=true
    • https://s3.amazonaws.com/pusolefosex/66862241737.pdf
    • http://posugez.epizy.com/bluetooth_3._0_android.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_off0000f2d0.bin
30438e800c198ff0a03ebc771ae02216196dd67c8ffb2afbfd419e3993b85fe2
pdf-font-stream PDF embedded font (sfnt) at offset 0xF2D0 5416 bytes
font_01_sfnt_off00010562.bin
aa65efd22f6554efad8ecf65bf8d8aee1f6174ce65ab6d2c43a966eef0811cd8
pdf-font-stream PDF embedded font (sfnt) at offset 0x10562 11220 bytes