Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1b8f704fe6db115…

MALICIOUS

PDF

79.4 KB Created: 2020-12-27 13:19:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 5a13cfe291772d3940907029ada9b525 SHA-1: d22f74bdd52d125931443a6c786c0c8acf2d16c8 SHA-256: a1b8f704fe6db115b0cc7ecb0ff03faf30fd14c34b753eed3ddb27f59ba2e857
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, suggesting a phishing or SEO manipulation attempt. ClamAV detection and ML classification strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are sufficient to infer a malicious purpose.

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
  • 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://traffset.ru/strik?utm_term=warframe+ropalolyst+guide PDF link annotation
    • https://cdn.sqhk.co/dijobika/hdgiiav/ants_go_marching_lyrics_cocomelon.pdfIn PDF document text
    • https://tolajugim.weebly.com/uploads/1/3/4/6/134647220/4786052.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409255/normal_5f95d0c728003.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407085/normal_5fe4e5575cd62.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425238/normal_5fb57c1dc6e43.pdfIn PDF document text
    • https://cdn.sqhk.co/nabixisaf/eLhggdA/adventure_motorcycle_tires_2020.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365547/normal_5f8f18fd80e73.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416661/normal_5fe793f07d288.pdfIn PDF document text
    • https://cdn.sqhk.co/sufadoma/PjfNFhh/97044696782.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409840/normal_5fdd26064dda0.pdfIn PDF document text
    • https://cdn.sqhk.co/sepufaziru/hhjaeTX/13305489857.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/0c957b6c-4290-4f14-911f-1d33b84f251e/5123840186.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4349f67d-7c62-44d6-96b7-0efab88f985a/devarujun.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC1A 5252 bytes
SHA-256: 93f9d5873a06ad992afcda72aafe7d494f7543312263eb750775af89af62f40c
font_01_sfnt_off0000fe10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE10 10932 bytes
SHA-256: 9ff115211a46bb2f6f452b847b47c20113e5a420f6e20660148bad1ac1b6708d
font_02_sfnt_off000122e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122E7 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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