Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa83f0bed0ff52ba…

MALICIOUS

PDF

84.2 KB Created: 2021-03-23 02:57:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 307c16fa2ca06dd2161e45bb7e3e01f4 SHA-1: 72259403053392e7d83901a7d32cc6d114c1460e SHA-256: aa83f0bed0ff52ba4435a543053624d7481973fdf024f14314f7855638301a72
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and an ML classifier, with ClamAV detecting it as a phishing trojan. The PDF contains a large number of external links, many pointing to other PDFs, suggesting a link farm or SEO abuse tactic. One of the primary external URIs, 'https://soxebez.ru/123?utm_term=corpus+juris+secundum+volume+9+pdf', is likely used to redirect users to malicious content or phishing pages. No scripts were extracted, but the PDF structure and numerous external links indicate a malicious intent to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://soxebez.ru/123?utm_term=corpus+juris+secundum+volume+9+pdf
    • https://static.s123-cdn-static.com/uploads/4494657/normal_5ffb7ee4bf06e.pdf
    • https://cdn-cms.f-static.net/uploads/4471703/normal_601070998510a.pdf
    • https://static.s123-cdn-static.com/uploads/4380072/normal_5fe38b4a11afe.pdf
    • https://cdn-cms.f-static.net/uploads/4470205/normal_603890d8d7443.pdf
    • https://cdn-cms.f-static.net/uploads/4411681/normal_604a900f35010.pdf
    • https://static.s123-cdn-static.com/uploads/4377128/normal_5fec25495991f.pdf
    • http://jakufodunod.getenjoyment.net/55837389075.pdf
    • https://cdn-cms.f-static.net/uploads/4471252/normal_6018e79c1574f.pdf
    • https://cdn-cms.f-static.net/uploads/4386824/normal_603eff8f6d676.pdf
    • https://cdn-cms.f-static.net/uploads/4415756/normal_60484497a6372.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/b7db79de-58cf-4be2-b25d-8910ea79e547/buwesom.pdf
    • https://uploads.strikinglycdn.com/files/95ab7186-df05-4b35-a327-277154730810/butusibevema.pdf
    • https://5d3a357a-25b2-4459-9cd8-210b235f7b36.filesusr.com/ugd/45e30f_02a2ace3422446698cbea3b647f31372.pdf?index=true
    • https://uploads.strikinglycdn.com/files/c7be88f0-f92d-4a58-878f-2fd92e61cdfc/legawigivi.pdf
    • https://11484d69-1612-41b9-9199-165df1f08223.filesusr.com/ugd/e2f197_f7cb41ef14f742a19d05f677e0c89bf0.pdf?index=true
    • https://9005a25f-7293-4a73-bb0f-bc58e8c16807.filesusr.com/ugd/e3834b_938cc3dead3d41a68733eed06d7db52c.pdf?index=true
    • http://jamenajiko.myartsonline.com/gukuwu.pdf
    • https://1094d5c0-a920-47c7-a1de-7e2d56a92d84.filesusr.com/ugd/47b1e8_8e8e9a35497c41d9b87ce4c8c14af9ac.pdf?index=true
    • https://1347de4c-4e54-429a-b84c-372e60bc5a2b.filesusr.com/ugd/6c98bc_9f499a25554449b085823bcd790a50ff.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fc7b.bin
3de28464c24440ca50f2e37084b0879706ca3765bed5958eaa6060f432b1c431		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFC7B 5208 bytes
font_01_sfnt_off00010e1a.bin
18cb75f27330e7da8bc75aaae12cced89a7b9d97db3a7ad597d2d40af926bf86		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10E1A 11764 bytes
font_02_sfnt_off00013641.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13641 4324 bytes

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