Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff82c23c0d9ed1d8…

MALICIOUS

PDF

88.8 KB Created: 2020-12-31 15:58:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: afc581d8eb1545a6e4047550dbf91bde SHA-1: 75c376f5283c6f64129b9ea582347eaa78607846 SHA-256: ff82c23c0d9ed1d8146c397acc1b9bb21f8fd764aceeba5e60dbb987556d69e0
214 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, including a known malicious redirector at 'https://traffine.ru/123?utm_term=american+airlines+777-300er+premium+economy'. The heuristic firings indicate this is a malicious redirector and a link farm, suggesting the document's primary purpose is to drive traffic to potentially harmful sites. The ML classifier and ClamAV detection strongly support its malicious nature.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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/123?utm_term=american+airlines+777-300er+premium+economy In PDF document text
    • https://cdn-cms.f-static.net/uploads/4370778/normal_5f8af7edbc1b6.pdfIn PDF document text
    • https://towetebofipu.weebly.com/uploads/1/3/1/4/131437669/1740699.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369141/normal_5fe47fad24611.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482638/normal_5fcdd780b4bfa.pdfIn PDF document text
    • https://libesomed.weebly.com/uploads/1/3/4/9/134904451/8198118.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370737/normal_5f8c56f666329.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470679/normal_5fe0a5baaab25.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413226/normal_5fc67e2b1755f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392658/normal_5f924e274cf1a.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/fonibinaraj/aqualift_self_clean_whirlpool_oven.pdfIn PDF document text
    • https://s3.amazonaws.com/liguwubore/rezerenukipeladisesare.pdfIn PDF document text
    • https://s3.amazonaws.com/rotafasaniz/guidepoint_consulting_rate.pdfIn PDF document text
    • https://s3.amazonaws.com/jagux/xufewozu.pdfIn PDF document text
    • https://s3.amazonaws.com/sebunuzu/mantech_international_timesheet_portal.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_off00011b32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B32 5588 bytes
SHA-256: ffd0d5add9e90eb9f3d866bd7c57e7ce7b76021dab2b9d1b0a8bd967268ad5ce
font_01_sfnt_off00012e2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E2D 11836 bytes
SHA-256: 9d4dbd970a22cb2e5646dc10f423ea246be4b573ef9281575bfd3ba830cfbad9

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