Malicious PDF — malware analysis report

Static analysis result for SHA-256 5545ca0427f8020e…

MALICIOUS

PDF

61.8 KB Created: 2021-01-06 07:22:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: e79c0b65a8e2a929618abc633cebfb5e SHA-1: 7e05764d6ae8ab19e355d8be5e50bfaa280bdb7a SHA-256: 5545ca0427f8020ee3851617ff645bfd628751f798249b7d25fa19ea931fb4e6
154 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly support its malicious nature. Although no scripts were extracted, the embedded URL is the primary indicator of compromise, suggesting the document is a lure to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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=ardex+cd+fine+data+sheet In PDF document text
    • https://benodamefeju.weebly.com/uploads/1/3/5/3/135346815/gavudexutas.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4498978/normal_5ff5096d3233b.pdfIn PDF document text
    • https://talapilodegopez.weebly.com/uploads/1/3/0/9/130969507/c75b2532f.pdfIn PDF document text
    • https://cdn.sqhk.co/vefuwebilux/iijim7p/cute_fox_wallpaper_for_phone.pdfIn PDF document text
    • https://cdn.sqhk.co/kuvapipitol/RBhTYNa/concerto_barroco_alejo_carpentier.pdfIn PDF document text
    • https://zefukigu.weebly.com/uploads/1/3/4/7/134718507/8436196.pdfIn PDF document text
    • https://cdn.sqhk.co/zipodumup/hbCvHnk/real_steel_toys_noisy_boy.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/26a147c4-23c3-44f5-b313-f712b0ae3c0c/color_by_number_worksheets_kindergarten_free.pdfIn PDF document text
    • https://s3.amazonaws.com/vonuxagupeduze/mekowe.pdfIn PDF document text
    • https://s3.amazonaws.com/buponuwebi/most_expensive_stamps_in_the_world.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_off0000b5a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5A6 5136 bytes
SHA-256: 722f3a3c7bf6fa73cfe921b06a550ccf036861c968ed8244102d75dccb4f3911
font_01_sfnt_off0000c71b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC71B 10064 bytes
SHA-256: 179655e8a8fa4429ce8d3e62329944aa08abb221535c5888340ef10a34b7d2a3

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