Malicious PDF — malware analysis report

Static analysis result for SHA-256 a07e4b8716e6d88c…

MALICIOUS

PDF

68.7 KB Created: 2021-03-09 13:40:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: dd9b56b2497afd0b58b61dc88e68224c SHA-1: 9adf5a79a73c8191d3b711809f198772d0f77ece SHA-256: a07e4b8716e6d88c25c09e96c421ba05a4b207e05286f8f78a7bb3e2797ee2e5
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://nipisod.ru/strik?utm_term=ocr+a+level+chemistry+breadth+paper+2019 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4456671/normal_5fda38e1a9a06.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374532/normal_60078b94dcdad.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411252/normal_6007102008794.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369774/normal_602eef3ec7c4a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4466161/normal_6002dd342691f.pdfIn PDF document text
    • https://pizeposinejuxow.weebly.com/uploads/1/3/2/6/132695365/topam_bumapenus.pdfIn PDF document text
    • https://disovipogazita.weebly.com/uploads/1/3/1/3/131398104/sulobaxamawe-zowelikupek-varune-xakobufowe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4391326/normal_5fe4c7152b773.pdfIn PDF document text
    • https://xolejapu.weebly.com/uploads/1/3/4/4/134491856/tafonepuxazuda.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413865/normal_5fec73a10aaaf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393209/normal_601056cfe1a52.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482002/normal_601d91d390a92.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490953/normal_5ff9277dcb76a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480886/normal_60007a6ce77e6.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/zatasipezeg/what_is_color_space_in_graphic_design.pdfIn PDF document text
    • https://s3.amazonaws.com/xumakomowi/47024765434.pdfIn PDF document text
    • https://s3.amazonaws.com/limewub/flight_boarding_pass_template.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/931a077d-33c0-48b8-b1b2-8106dcb2b49c/tugagafe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eee32481-dd28-4a12-bb88-ff1ca20ef6b4/wagner_paint_crew_plus_parts.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/519fe717-f4e8-4a0d-96b9-b3497d49091a/28960397976.pdfIn PDF document text
    • https://s3.amazonaws.com/jolituzoji/how_to_train_upper_chest_bodyweight.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_off0000ce5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE5D 6124 bytes
SHA-256: e9d2459054f5d4f424741b36db8761be48e39080670d15cfc5aae706250c83ce
font_01_sfnt_off0000e306.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE306 10124 bytes
SHA-256: 9d21ea9075fafe4802254d30338c0c63b3db57990642a537a8a76ee625d495fd

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