Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9bfb7721f9aed8f…

MALICIOUS

PDF

81.2 KB Created: 2021-02-26 09:53:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 1114243dcfd9e94a432312d91bc7de00 SHA-1: 4d1793071472040f5b61d089dc66204a04ead70f SHA-256: b9bfb7721f9aed8f248453dceb2314ed04bb9ab3c499ea2c035c66be8fbaf075
154 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, indicating a phishing or malware distribution attempt. The document body, though heavily obfuscated, suggests a lure related to 'Shark fabric steamer instructions'. The presence of embedded URLs and the ML classifier's high confidence score support the malicious verdict. No scripts were extracted, but the embedded URL is the primary indicator of malicious intent.

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/wb?keyword=shark%20fabric%20steamer%20instructions In PDF document text
    • https://cdn.sqhk.co/gizoxemovefi/Esjhhdu/business_process_management_examples_ppt.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374522/normal_5fce596caac11.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415331/normal_60050d067b582.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386094/normal_600d136f50acd.pdfIn PDF document text
    • https://cdn.sqhk.co/lixipadiwel/i3x6mSR/53126855746.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4389084/normal_5ffddeb9bf209.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449618/normal_602a700468f58.pdfIn PDF document text
    • https://cdn.sqhk.co/dexujagafir/bgjnhdO/61359041908.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4468838/normal_5ffe2d9492cb3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485699/normal_5fdfb9a6b9885.pdfIn PDF document text
    • http://wuguxij.iblogger.org/jisitojivol.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420222/normal_60304f2e88497.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379973/normal_601e88db56a76.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486367/normal_5ff918319ba7a.pdfIn PDF document text
    • https://cdn.sqhk.co/pavetikedur/hjgdwpH/talking_tom_and_friends_characters_wiki.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sotatelovutegep.epizy.com/asphalt_8_offline_game.pdfIn PDF document text
    • http://bodamuma.rf.gd/22191055479.pdfIn PDF document text
    • http://vumesurev.epizy.com/tedavedu.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ecb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECB8 5396 bytes
SHA-256: 3e9ef8028007ad66bc700644410f83f2bdef40d346f176495fb2f30c401d0bd7
font_01_sfnt_off0000fee9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEE9 10468 bytes
SHA-256: a0a814db3aa9b2cb0c82421d05c0bd20c2ec74a15dee10fd72841423acf56c0f
font_02_sfnt_off000122f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122F2 16076 bytes
SHA-256: 97990adcc91a1e334b404002f9a6b356dd0e0e66c9193a0499481f503a30e292

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