Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9fc1613acef053c…

MALICIOUS

PDF

68.8 KB Created: 2021-01-10 00:47:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 92e8fd2fe5d04a365520052e07e3cb41 SHA-1: 521bdc1d22ca1937978fa9fefeb2a1ccc94d098d SHA-256: e9fc1613acef053cbb1751deb6c0f3c067e4b8120ae7c500a8ab18311bbe1e7a
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://traffine.ru/aws?utm_term=geometry+worksheet+answers PDF link annotation
    • https://cdn.sqhk.co/nuxoporerom/ihgegjX/pudawibaso.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367667/normal_5f91799aaa72e.pdfIn PDF document text
    • https://site-1167978.mozfiles.com/files/1167978/biker_mice_from_mars_throttle_x_oc.pdfIn PDF document text
    • https://site-1167978.mozfiles.com/files/1167978/poxonekutazoluwubizuto.pdfIn PDF document text
    • https://gukigosipuwerus.weebly.com/uploads/1/3/4/7/134755691/vurebesesapi.pdfIn PDF document text
    • https://site-1173522.mozfiles.com/files/1173522/e_gregory_wells_opinions.pdfIn PDF document text
    • https://cdn.sqhk.co/xiteduva/hhfW1if/wevukanedutavivuxuvu.pdfIn PDF document text
    • https://cdn.sqhk.co/pemazekefise/ijKhdjg/rpg_blazing_souls_accelate_mod_apk.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412900/normal_5febdfafb8749.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/vonutavekip/66701086752.pdfIn PDF document text
    • https://s3.amazonaws.com/jukezeluf/korelurovurenesunuj.pdfIn PDF document text
    • https://s3.amazonaws.com/mejawiwomak/women_s_formal_wear_hire_gold_coast.pdfIn PDF document text
    • https://s3.amazonaws.com/jukoxisojow/unification_of_italy_and_germany_worksheet_answers.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_off0000d223.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD223 5184 bytes
SHA-256: 8da9c7a2374d9e2f837a9eefd87f5e526c518cf8d2aed720bb0fc4644ed83b1f
font_01_sfnt_off0000e3b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3B4 10260 bytes
SHA-256: 5789182c91df4604d99e67f876a60df926d54ba888f16a1fb243db148fca85cb