Malicious PDF — malware analysis report

Static analysis result for SHA-256 28d537d43b182524…

MALICIOUS

PDF

74.6 KB Created: 2021-04-26 00:54:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: c0c1a1214b81fc525da9b6c6f4c3e4b8 SHA-1: d1bbe744810ceec831824b3a63f1f97df132cdf3 SHA-256: 28d537d43b1825248c2499cb84479c172d7067b4438dbd37c48cc07f486db86c
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 point to other PDFs, suggesting a link farm or SEO poisoning tactic. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external URLs are indicative of malicious activity.

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://leonvi.ru/strik?utm_term=how+to+check+if+a+tivo+has+lifetime+service PDF link annotation
    • https://cdn.sqhk.co/zogowefu/jdhf4ja/sozifekike.pdfIn PDF document text
    • https://cdn.sqhk.co/daborofus/aMicTzC/cramped_hands_during_pregnancy.pdfIn PDF document text
    • https://cdn.sqhk.co/lotivadafe/jhbW3jb/68053176492.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/toguvaju/83209018152.pdfIn PDF document text
    • https://s3.amazonaws.com/kefiperizonofu/allpowers_20a_solar_charge_controller.pdfIn PDF document text
    • https://s3.amazonaws.com/novifamigot/when_is_half_term_in_the_uk_2019.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eff139e9-5d3a-4afb-8771-f95b4e346e02/10217704367.pdfIn PDF document text
    • https://93655b3f-791c-4b17-adcc-ca91401ac088.filesusr.com/ugd/99b222_30f3286bd14040bfb00e87b4dd07533a.pdf?index=trueIn PDF document text
    • https://0bdb67af-4c57-4a6e-9706-714cc80719f5.filesusr.com/ugd/fc840b_9ec001e186d1458194a0dd8f5a327c39.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sojuravewi/35595141342.pdfIn PDF document text
    • https://s3.amazonaws.com/bokofapig/get_lucky_saxophone_sheet_music.pdfIn PDF document text
    • https://36fc1fe3-b646-4cc1-b6e9-de51469aea27.filesusr.com/ugd/3eb4bd_a585f859a17546949d0ae1dda56051bb.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e4ed08b8-6a98-47eb-aa09-b193043077bf/alcatel_one_touch_idol_3_5.5_update.pdfIn PDF document text
    • https://s3.amazonaws.com/divikufifir/potesunixeviv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5f0bc009-dbfa-43f5-9967-4e577b3d52e6/79148510976.pdfIn PDF document text
    • https://3e1af3dc-cf37-4f58-935d-0a6065bc5ce9.filesusr.com/ugd/3ca236_01f2a89fb9cb454d87efa662873d46f8.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/02c0d3a1-0ca6-4f93-ab7b-02a01ad76fb9/republic_of_doyle_season_5_episode_12.pdfIn PDF document text
    • https://s3.amazonaws.com/sitok/wusakezoboxa.pdfIn PDF document text
    • https://d2ea4bfc-f92a-4379-acf2-d9b69981ddb7.filesusr.com/ugd/739437_2f6e14bbfb6c49e9b1bf04c4c4fae5ed.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_off0000e6f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6F2 5296 bytes
SHA-256: 59e9cc0d3ab52978c0f4e46ec11006045eb2f964f33046aaddd0271ec88d3934
font_01_sfnt_off0000f8e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8E8 10508 bytes
SHA-256: 3edacfc078d0308bf7961bfd2758b9a15a48fc5d43edc3688031ed8fb27afb88

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