Malicious PDF — malware analysis report

Static analysis result for SHA-256 22d83e325b12042a…

MALICIOUS

PDF

77.8 KB Created: 2021-01-06 08:39:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 9dff3ab140208eb40d2bab9ad7eb946a SHA-1: 36b94a41e9f12cb64b5eb845be08bacb983defb1 SHA-256: 22d83e325b12042a7f4c6c1e5462f40bd5acbb250886c78f49c2f26118e208fa
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a critical heuristic identifying it as a PDF link farm. The primary URL points to a site that appears to be related to SEO manipulation. ClamAV and an ML classifier also flagged this PDF as malicious, specifically as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and link farm behavior suggest an intent to redirect users to malicious or deceptive content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://trafffi.ru/aws?utm_term=space+questions+and+answers+for+grade+5 PDF link annotation
    • https://cdn.sqhk.co/jagakutojut/i5gik34/papol.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408584/normal_5ff514b22bf00.pdfIn PDF document text
    • https://cdn.sqhk.co/pajerelo/jdageje/57369897567.pdfIn PDF document text
    • https://cdn.sqhk.co/fudamewojaf/5Nhahff/videos_engracados_do_whatsapp_download.pdfIn PDF document text
    • https://cdn.sqhk.co/tupipitijil/hbPhcLy/rexall_london_ontario.pdfIn PDF document text
    • https://janikopet.weebly.com/uploads/1/3/4/6/134690806/lebigan-jotojoriw-fewizapo.pdfIn PDF document text
    • https://vopevejefed.weebly.com/uploads/1/3/1/6/131606133/rogatotatasavox.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/49ac0e4a-d9bd-46b0-9014-09272b9c450d/jiangdong_jf168_5._5hp_engine_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5e5bb35f-16bc-4433-bbc7-f43cab274ba1/pumapomesokivuwotixur.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9c55ef0e-1abc-4d36-8e26-8937ecb8bcad/83771767837.pdfIn PDF document text
    • https://s3.amazonaws.com/sinadi/bombay_tamil_movie_tamilyogi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9fb25c56-98fd-4645-b40b-7c1fdb22ee85/2191315094.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d4056ea5-0b1f-4dba-9bba-d6415ae46f66/pratik_ingilizce_konuma_klavuzu_pd.pdfIn PDF document text
    • https://s3.amazonaws.com/wudibirewuduto/teleposi.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_off0000f185.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF185 5736 bytes
SHA-256: f3958ed2fbe4dd72f5b26e2ee6b8a189cb1fe9d09d263458f8e763d0dffd5b2d
font_01_sfnt_off00010527.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10527 10904 bytes
SHA-256: 208782956a4d0fdfe4470fdb9ef444a065e1a2e92695b09a177ffb54de95352c

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