Malicious PDF — malware analysis report

Static analysis result for SHA-256 58de5a28c252c86d…

MALICIOUS

PDF

64.1 KB Created: 2020-11-18 11:05:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: d008684464fd5ce0b42b4fa5a4eb24c1 SHA-1: ba9ab7ed0b3da892a0bda446f5f9dae1832fe824 SHA-256: 58de5a28c252c86d4b900678f65b834a7ff37041cf911074e45d973b2db09699
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, and it contains numerous embedded links. One critical heuristic indicates that the PDF links to known malicious redirector infrastructure, specifically `https://gettraff.ru/strik?...`. The presence of a link farm suggests an attempt to distribute malicious content or conduct phishing operations. No scripts were extracted, but the PDF structure itself facilitates the malicious redirection.

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
  • 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.
  • 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.
  • 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://gettraff.ru/strik?utm_term=%25D1%2582%25D0%25BE%25D1%2580%25D1%2580%25D0%25B5%25D0%25BD%25D1%2582+%25D1%2582%25D1%2580%25D0%25B5%25D0%25BA%25D0%25B5%25D1%2580+%25D0%25B4%25D0%25BB%25D1%258F+%25D1%2583%25D1%2581%25D0%25BA%25D0%25BE%25D1%2580%25D0%25B5%25D0%25BD%25D0%25B8%25D1%258F+%25D0%25B7%25D0%25B0%25D0%25BA%25D0%25B0%25D1%2587%25D0%25BA%25D0%25B8 In PDF document text
    • https://cdn-cms.f-static.net/uploads/4366041/normal_5f87195f395f8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390661/normal_5f95d19137a01.pdfIn PDF document text
    • https://bujupovira.weebly.com/uploads/1/3/4/4/134472582/pozezemafanugonex.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449996/normal_5fa076254e4a8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/2b8c23e7-37e2-4579-9b3d-90249b4f03c6/joxepejemowez.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e22a9d24-160b-453e-b640-1e15c36e1183/86773063681.pdfIn PDF document text
    • https://s3.amazonaws.com/lodunixodetum/kelvinator_impression_series_300_freezer_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2b011919-3efc-4f9c-93ac-7bc83c4a3824/dojodowasitowuxomonulelud.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e791ff04-a998-4b0a-aac4-5b8dabd3e6ac/fogajoxoze.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ec42f78e-c743-4faa-be1c-211e4d365636/16304186291.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/56c7966c-7ce8-46ba-aab5-7e5fb079adbc/51784547940.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f861c1bd-b235-4c3f-b0a8-8207497b7018/nhaccuatui_lite_apk.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_off0000b515.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB515 5688 bytes
SHA-256: 83144ea1f57b6a8225be9f72b96ade23ca786e74a442451f284fcb7fab4d88ca
font_01_sfnt_off0000c822.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC822 12724 bytes
SHA-256: 99238627168e2cafedcd76c33a811cc98ff24c68b907834c6a26b169f635bc42

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