Malicious PDF — malware analysis report

Static analysis result for SHA-256 93f8b051bdae6609…

MALICIOUS

PDF

69.2 KB Created: 2021-04-15 23:02:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: cfa770a10f1756b8405781cc8ce5cb2a SHA-1: 40518aa58d4d508c730ead414804233c2395906a SHA-256: 93f8b051bdae6609feff0a8f12cd83e43f4137c9f2769f0a61877aec1b7f2c89
164 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 other PDF files, suggesting a link farm or redirection mechanism. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. The presence of embedded URLs and the heuristic for a link farm support the classification as a malicious document designed to distribute further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://resalured.ru/strik?utm_term=essential+elements+flute+book+1+free+download PDF link annotation
    • https://cdn.sqhk.co/gisusisabez/b5ghggY/to_do_list_movie_soundtrack.pdfIn PDF document text
    • https://cdn.sqhk.co/kejofuvata/T2lZtEM/zirat.pdfIn PDF document text
    • https://pobogovowot.weebly.com/uploads/1/3/5/3/135323888/4268736.pdfIn PDF document text
    • https://cdn.sqhk.co/nimotixalulo/sKhdJgf/goldfish_go-_karts_game_online.pdfIn PDF document text
    • https://cdn.sqhk.co/bisidilit/JdYha21/81863008994.pdfIn PDF document text
    • https://cdn.sqhk.co/nikajovefer/nPicjfv/candy_frenzy_2_level_1-_47.pdfIn PDF document text
    • https://turakenedonatup.weebly.com/uploads/1/3/4/6/134610331/0925e21e9ba7a35.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/pegozegi/xotinotoxibo.pdfIn PDF document text
    • https://s3.amazonaws.com/xugigabitulu/bacterial_transformation_kit.pdfIn PDF document text
    • https://s3.amazonaws.com/minabiwa/werezog.pdfIn PDF document text
    • https://s3.amazonaws.com/jasadavebaga/rifetaretivekos.pdfIn PDF document text
    • https://s3.amazonaws.com/sojebelevenex/53103958902.pdfIn PDF document text
    • https://78151a86-a557-4e49-81aa-a2539eea45c7.filesusr.com/ugd/204f4f_16e81995801644b7bd96d306c5c6f327.pdf?index=trueIn PDF document text
    • https://557345b1-98c6-442d-b460-9e357c178e5b.filesusr.com/ugd/dfb5f8_b29f2388c99c40dbb15c5e89df3867d5.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/ganubifirigevi/18558183856.pdfIn PDF document text
    • https://s3.amazonaws.com/dixaleko/poesias_fernando_pessoa.pdfIn PDF document text
    • https://1fd079ea-3156-4ae8-a0b4-6153e0b529c5.filesusr.com/ugd/e66bf7_b538bffc25de45f68cff43f374394722.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zozofufulolig/81177565355.pdfIn PDF document text
    • https://s3.amazonaws.com/kegubinefuda/54650982598.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_off0000d1af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1AF 5356 bytes
SHA-256: 904cca6b1d76d573a0e67d5ce3f82df5dd6fd476813398581335a59046d9cb90
font_01_sfnt_off0000e3ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3EA 10384 bytes
SHA-256: dbdc2c12e849f7e6112485bb9159318b9a21ab95c8a6f03058b0cc7c6dc2c41c

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