Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec8fc2f527af69e8…

MALICIOUS

PDF

79.1 KB Created: 2021-05-01 12:27:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 7070cfd11a318327df9084bf1c169e00 SHA-1: 91b863334d3b32a123f66e4b241646b76448ccf7 SHA-256: ec8fc2f527af69e8f62c44597552cdfed2c768eca0535d0650df825527a532e2
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to potentially malicious domains, indicating a link farm or phishing attempt. ClamAV and ML classifiers confirm maliciousness, specifically flagging it as a phishing trojan. The embedded URLs suggest the document is designed to redirect users to malicious sites for further exploitation.

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://pelibifir.ru/strik?utm_term=latin+and+greek+root+word+meaning+match+photo PDF link annotation
    • https://xogevowizixid.weebly.com/uploads/1/3/0/9/130969953/birip.pdfIn PDF document text
    • https://vuvunovugigadi.weebly.com/uploads/1/3/0/8/130814714/mibuxi.pdfIn PDF document text
    • https://cdn.sqhk.co/zigimovovu/RGwiRN1/paper_plane_planet_hack_apk.pdfIn PDF document text
    • http://useplafond.xyz/pg_diploma_courses_in_business_analytics_in_canadakcykv.pdfIn PDF document text
    • http://mxbur.fun/legendary_royale_apk_20207zbw0.pdfIn PDF document text
    • http://wei-nmvc.com/walalumajujureguduhzc30.pdfIn PDF document text
    • https://cdn.sqhk.co/kerutadit/eihghge/winter_warlock_quotes.pdfIn PDF document text
    • https://wuduzavuvavazi.weebly.com/uploads/1/3/4/6/134618101/nevevexuxi_takazobawibi.pdfIn PDF document text
    • http://islandlandscapesbb.com/secure_vpn_uptodownlsttb.pdfIn PDF document text
    • http://barcaporirternet-interbank-pe.com/inorganic_chemistry_book_housecroft33pc7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://67258aaf-84c5-4a88-bfd2-1aa7ddb6c27a.filesusr.com/ugd/850f07_ba220c0242534af4a6293131a3dab743.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/verirejon/rajug.pdfIn PDF document text
    • https://s3.amazonaws.com/luworizesupox/corona_renderer_tutorial_3ds_max.pdfIn PDF document text
    • https://s3.amazonaws.com/gavexilatuvitaz/32322978587.pdfIn PDF document text
    • https://d3826037-6016-486c-99e9-dc41bc666644.filesusr.com/ugd/b81754_793b6050b3ea4fb89c7df7488d194659.pdf?index=trueIn PDF document text
    • https://ce099f17-eb12-430b-a452-8d789b3ee5a8.filesusr.com/ugd/aef5b7_0862c0af35ed490eb9d72afb056596c3.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vuzotisenixava/answer_to_complaint_for_absolute_divorce.pdfIn PDF document text
    • https://944bcc21-9f45-42c2-9889-8cf837fa5d1c.filesusr.com/ugd/50f869_1051317b59e94b6fb8199136c77fca67.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kakef/zunosavunobawuwaw.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_off0000f2cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2CB 5376 bytes
SHA-256: cf26d5bb30a6c66634b0f0f812f2af61209f3d69df7a09a3756eec91215accac
font_01_sfnt_off00010504.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10504 13248 bytes
SHA-256: 85d9072dfe66eca650fc185c30a5cd7dd69b71e1fc56260f20dd4878e4414e6e

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