Malicious PDF — malware analysis report

Static analysis result for SHA-256 da8a2ae01a89b20d…

MALICIOUS

PDF

82.6 KB Created: 2021-03-15 07:42:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 20f6cb1beb5303c67891744d7abeaa40 SHA-1: 4612cfc00eeaedc7ff400764e3bf8afc35c00010 SHA-256: da8a2ae01a89b20dbf9c958bc9cc0e8681592f5f095a2868560c611cdf960198
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are dynamically generated, indicating a link farm designed to host malicious content or phishing pages. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and extensive link farm point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.
  • 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://lozipotod.ru/wix?keyword=brother+xl2600i+sewing+manual PDF link annotation
    • http://rusherx.studio/86854887503jg0sg.pdfIn PDF document text
    • http://lufafemazivug.iblogger.org/2870046568.pdfIn PDF document text
    • http://greyfruit.space/98430842661v4pvn.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/wixatax/refilaburuxupolur.pdfIn PDF document text
    • http://wuselenefoz.rf.gd/os_evangelhos_apcrifos.pdfIn PDF document text
    • https://s3.amazonaws.com/fatikonavori/18054510297.pdfIn PDF document text
    • https://aa3bb5c3-2bd4-4791-9e2a-6e31d5009b04.filesusr.com/ugd/60e703_84f33227551b43069e2b9276e94d5249.pdf?index=trueIn PDF document text
    • https://c83cbd6e-a134-4b49-ba12-49f24c654ad9.filesusr.com/ugd/904a8b_1c6d7bf563d34d7b82f8557bb159dff1.pdf?index=trueIn PDF document text
    • https://a146b927-ed54-472d-b3a8-6b137e313b92.filesusr.com/ugd/4d400c_531888aa0212474fae3d574582ecb68e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kugelilizibuwum/complex_analysis_ahlfors_solutions.pdfIn PDF document text
    • https://s3.amazonaws.com/pizivurapab/jafuderonunedemi.pdfIn PDF document text
    • http://dimizisunope.epizy.com/xusojetizofonekofeg.pdfIn PDF document text
    • https://caf0f927-206f-4b4e-aa34-0dd3da53679b.filesusr.com/ugd/83d902_e4d6cfe9647f419c915d071067d409ab.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zobuwubedak/bohemian_rhapsody_piano_sheet_letters.pdfIn PDF document text
    • https://e9593579-f51f-4dc6-af55-2543ab512b45.filesusr.com/ugd/37952c_34694c6cd7e24579822f7101ba4657c9.pdf?index=trueIn PDF document text
    • https://51fd5013-30c4-43d1-89ce-86564632a3b5.filesusr.com/ugd/9f06f8_5a116b87dbdd4affb5cbc8f2b7064a64.pdf?index=trueIn PDF document text
    • https://eadb47d6-6712-4ecd-aa5a-2cdcf2d90b86.filesusr.com/ugd/c844bf_5beb4edf67604b26afdaebb23cd46277.pdf?index=trueIn PDF document text
    • https://1d942ef5-affb-47d8-8f99-70a3d187b733.filesusr.com/ugd/3283b0_83ee86b7593e466488cef0694f8ccb97.pdf?index=trueIn 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_off000103d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103D2 5736 bytes
SHA-256: 0da33ab4dbe7a8a2871c99133fd55394e117b2394bde1a59d69ae6b27b8fae63
font_01_sfnt_off00011748.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11748 11392 bytes
SHA-256: 6be3b4fec6739daa0cdb05dec2de5d635d02407e73ef020a33a3b825ad25ee54

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