Malicious PDF — malware analysis report

Static analysis result for SHA-256 65e843133fce9917…

MALICIOUS

PDF

72.9 KB Created: 2021-02-28 09:43:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: b2fb721a6c2ee384cfb76c3067ac5386 SHA-1: 4f18c5c31af3a79ff43a545eea0dfda1f3e13cbc SHA-256: 65e843133fce991730283c5d2a4db2dfb259f9440346a071b62a206ddafa656b
126 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with one specifically disguised as a link to print a lease agreement. This URL, along with others pointing to disposable hosting and potentially malicious domains, suggests a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to deliver a second-stage payload.

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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://resalured.ru/strik?utm_term=how+to+print+a+lease+agreement PDF link annotation
    • https://cdn.sqhk.co/jarixizotib/d0jyAE9/miriam_the_escape_apk_mod.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465545/normal_5feb1d9a37f63.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409606/normal_602226a45b815.pdfIn PDF document text
    • http://xitawefavam.medianewsonline.com/54165099357.pdfIn PDF document text
    • https://cdn.sqhk.co/sebutarukaw/4vidJgf/how_to_get_talisman_of_beasts.pdfIn PDF document text
    • http://liwurivosopap.medianewsonline.com/22510785915.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390328/normal_60271a6fe1248.pdfIn PDF document text
    • https://cdn.sqhk.co/wokinuge/ohbUqC9/teziton.pdfIn PDF document text
    • http://zijiwox.iblogger.org/52522363365.pdfIn PDF document text
    • https://cdn.sqhk.co/lajefage/Ehjwjbu/doxadijinotu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383913/normal_602ff9017f60c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4503584/normal_600d528b6883c.pdfIn PDF document text
    • http://diniwesavaku.iblogger.org/bibojigelem.pdfIn PDF document text
    • https://cdn.sqhk.co/wujakegu/dLdQgjd/navneet_sikera_wikipedia.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/vavabi/online_exhibitor_manual_adipec.pdfIn PDF document text
    • http://puwekaxaxowiza.epizy.com/bisatobetalixuzajuxe.pdfIn PDF document text
    • http://wesufonezis.epizy.com/unscramble_sentences_worksheets_for_kindergarten.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_off0000e1b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1B3 5192 bytes
SHA-256: 210ae81dc0a63ba4c9aafb4b6677620d5d0e3005e3343f3c0b609c3253cccd4f
font_01_sfnt_off0000f358.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF358 10228 bytes
SHA-256: 4a1da3b1a2df623ffcb24d5f37ca8d66bad13b8655afba525a261ef6b9bd22cd

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