Malicious PDF — malware analysis report

Static analysis result for SHA-256 f42ff28af5822500…

MALICIOUS

PDF

85.9 KB Created: 2021-01-02 20:04:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 2a40fae7fc9a707c74f4e76b2d0129f1 SHA-1: 72710e145b21cce7f1ee497fbcbabbb25a8eb41b SHA-256: f42ff28af5822500c9d2b1929017311a15784cc2f76f845c44a511740d176f59
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a critical heuristic identifying a 'PDF_SEO_LINK_FARM'. One prominent URL, 'https://trafftec.ru/123?utm_term=carrie+stephen+king+pdf+ita', appears to be a lure, suggesting a phishing or malware distribution attempt. The presence of ClamAV detection and ML classification further supports its malicious nature. Although no scripts were explicitly extracted, the PDF structure and link farm indicate an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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/123?utm_term=carrie+stephen+king+pdf+ita PDF link annotation
    • https://senorori.weebly.com/uploads/1/3/4/6/134641151/535482.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388813/normal_5f918b88c6b04.pdfIn PDF document text
    • https://dakufosaxem.weebly.com/uploads/1/3/4/7/134771611/winal.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469126/normal_5fd67e9b156f1.pdfIn PDF document text
    • https://bojojibapofaz.weebly.com/uploads/1/3/4/4/134478515/0cecfdd8b6a.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/tedowafomaru/getbitmap_from_imageview_android.pdfIn PDF document text
    • https://s3.amazonaws.com/wonoti/psychology_class_11_textbook.pdfIn PDF document text
    • https://s3.amazonaws.com/xugigabitulu/verbal_analogies_practice_test.pdfIn PDF document text
    • https://s3.amazonaws.com/dezajok/63761098082.pdfIn PDF document text
    • https://s3.amazonaws.com/pewebopufupe/61152427395.pdfIn PDF document text
    • https://s3.amazonaws.com/wolina/9671100626.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e0091dff-fb80-4b67-bd0d-9f40be112605/praise_and_worship_lead_sheets.pdfIn PDF document text
    • https://s3.amazonaws.com/forupokisip/8178423079.pdfIn PDF document text
    • https://s3.amazonaws.com/wifukedot/rexedizotuxevovexuwuru.pdfIn PDF document text
    • https://s3.amazonaws.com/tokit/secret_audio_recorder_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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001029c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1029C 5036 bytes
SHA-256: db5b3d087ed2b5b9bf58872ca437530b33a3bc54288b337d3e2effaca7d52a90
font_01_sfnt_off000113b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113B4 12224 bytes
SHA-256: aa77d3cf00d33506facd447adfca9f79fc4a30f522876a8247a86b6f0f515b06
font_02_sfnt_off00013cb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CB4 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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