Malicious PDF — malware analysis report

Static analysis result for SHA-256 dff91f6ca3c2654d…

MALICIOUS

PDF

83.8 KB Created: 2021-01-04 18:32:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 198d47ba4b1b912c7d177cf323efaf4e SHA-1: 9bf11e31a84b4531464e95d5f380e6951fce9a0c SHA-256: dff91f6ca3c2654d0c4884b9e70f6422394a615899bf108cdeb99e5e757d847b
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing or SEO link farm attack. It contains numerous external links, including one pointing to 'trafftec.ru', suggesting an attempt to redirect users to potentially harmful content. The presence of embedded links and the overall structure indicate a malicious intent to manipulate search engine results or lead users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://trafftec.ru/aws?utm_term=flyff+billposter+int+aoe+guide PDF link annotation
    • https://jekufagiz.weebly.com/uploads/1/3/0/7/130739150/2182694.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421330/normal_5fbc3481e8f62.pdfIn PDF document text
    • https://gojupisot.weebly.com/uploads/1/3/4/0/134016698/b5971b388b5b63.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412174/normal_5fc40a46508e9.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://s3.amazonaws.com/takateg/swing_java_eclipse.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/83225010-f747-474d-8af8-948a1a371353/sebosa.pdfIn PDF document text
    • https://s3.amazonaws.com/fewifuwu/96932800087.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/77746b36-d14b-45c0-8866-e885d5273bef/arms_reach_co_sleeper_set_up.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/91728bb4-4113-4025-9eef-94b630ddfc81/songs_about_spring_and_renewal.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d8c86b48-8950-4367-afb0-015bb1c25fa9/microsoft_dynamics_crm_2013_unleashed.pdfIn PDF document text
    • https://s3.amazonaws.com/jefobexapulow/obr_fiscal_sustainability_report.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e41b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE41B 5288 bytes
SHA-256: 1acf13ad6eb601bb8d291ed88eef8660a9f5512e408e024cec61ba8cd9f04199
font_01_sfnt_off0000f620.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF620 11424 bytes
SHA-256: b093bfae47fb4f1ac2683c602c8ec247fa3924437e080bad441e6dd64b1cfc94
font_02_sfnt_off00011cf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CF5 16316 bytes
SHA-256: 7a612b0ec029b71a5f5a18335ee6ff8727e7954ff6482f02af4967b462607ed9
font_03_sfnt_off00013294.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13294 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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