Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc2284dfb50816c8…

MALICIOUS

PDF

77.4 KB Created: 2021-02-10 15:34:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 039947108676894f30e0256bc24e0189 SHA-1: d4c49305f2608940239b93120d6c481a79057e11 SHA-256: bc2284dfb50816c82530c62960f5288b0ddcc1355bc29ff841647f74c9a09486
154 Risk Score

Malware Insights

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

The PDF file contains a link to a known malicious redirector, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly support its malicious nature. Although the document body is heavily obfuscated, the presence of a malicious URL is a critical indicator of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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://crophysi.ru/123?utm_term=worksheet+writing+chemical+formulas+and+naming+compounds+answers In PDF document text
    • https://cdn-cms.f-static.net/uploads/4379048/normal_600a3b0b1172e.pdfIn PDF document text
    • https://cdn.sqhk.co/bulixanejad/LjbLie8/66552742934.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404725/normal_5fcf2e4dd7784.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422134/normal_600fb678a53e6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414334/normal_5fe8458d4f268.pdfIn PDF document text
    • https://cdn.sqhk.co/gujuvizaja/1w5ggYw/classic_car_auctions_in_ontario_canada.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451567/normal_5fdad0b7b1cb8.pdfIn PDF document text
    • https://cdn.sqhk.co/kesokirow/ggibwsh/best_deals_on_amazon_right_now.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4371004/normal_5fe3f37f096af.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380090/normal_5ff68a370f9b4.pdfIn PDF document text
    • https://cdn.sqhk.co/xawobovuji/AlUigVp/70257455304.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/tasufagijaremo/japigi.pdfIn PDF document text
    • https://s3.amazonaws.com/vuforewebub/superannuation_guarantee_late_payment_offset_election_form.pdfIn PDF document text
    • https://s3.amazonaws.com/vixuwogetiv/healing_crystals_and_stones_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/musoxifuvitalo/android_10_update_mobile_list.pdfIn PDF document text
    • https://s3.amazonaws.com/nopomewegobij/48169397231.pdfIn PDF document text
    • https://s3.amazonaws.com/zebarufuridorur/norepiwugoxi.pdfIn PDF document text
    • https://s3.amazonaws.com/vawoginele/jetmore_lake_fishing_report.pdfIn PDF document text
    • https://s3.amazonaws.com/pisik/milile.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_off0000efd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFD5 5736 bytes
SHA-256: 194e77c410b8292edece419ccf729161e438d44e33d32f23249d508eed5fb307
font_01_sfnt_off0001035c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1035C 10796 bytes
SHA-256: 79c1161d6ef0838a7fcdbe994212128c68de0a92222d61a3dc329fdadc005aa5

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