Malicious PDF — malware analysis report

Static analysis result for SHA-256 28edaa11f3c12fd7…

MALICIOUS

PDF

77.3 KB Created: 2021-01-08 01:27:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: d104ebb666e2fe5b734593257d8bacf0 SHA-1: 804e521ce9cb50577e59d872080bbe3e730efce4 SHA-256: 28edaa11f3c12fd75d4d4004bbf5d173ae9f01bcfd49c3c7387791dd327b424b
214 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with a critical heuristic firing for a malicious redirector link to 'traffine.ru'. Another critical heuristic indicates a PDF link farm, with 'cdn.sqhk.co' being a prominent example. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery.

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
  • 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/wb?keyword=allegiant%20stadium%20las%20vegas%20virtual%20tour In PDF document text
    • https://cdn.sqhk.co/sepetuvab/mjaLjhH/fusifituzam.pdfIn PDF document text
    • https://turakenedonatup.weebly.com/uploads/1/3/4/6/134610331/1549c9577a8a181.pdfIn PDF document text
    • https://kelurefuvaw.weebly.com/uploads/1/3/0/9/130969237/91166636f3e.pdfIn PDF document text
    • https://cdn.sqhk.co/lukedivibeb/c6aqtge/windows_lock_screen_anime_wallpaper.pdfIn PDF document text
    • https://nibevomixosu.weebly.com/uploads/1/3/4/1/134108547/c286ced19607.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/jiguwuzobozobaz/bleach_episode_guide_no_filler.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6affee29-cebc-4264-8e0c-16afcbe538e9/barrett-_jackson_2021_covid.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e2ca8761-bab6-4dfe-928f-d72a80454761/89075384324.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d30d62d6-08c1-4ff3-a106-b78ebc029b13/yum_yum_donuts_merced.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fb8fa343-c150-4e77-83bc-dd340813f33b/emergency_room_in_spanish.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6c8d2194-81a5-443a-9602-e0fc62f7fa6c/cookie_clicker_just_plain_lucky.pdfIn PDF document text
    • https://s3.amazonaws.com/viboxikuz/18387346351.pdfIn PDF document text
    • https://s3.amazonaws.com/gazitif/blog_templates_bootstrap.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/74abbdf7-5aa3-47a6-8e9b-b063b127823f/munelubemuf.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_off0000ef63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF63 5196 bytes
SHA-256: 43e14d91df47657bec8cc6c6043483d5f110bd1fa0699824f4d5edf73753178e
font_01_sfnt_off000100fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100FC 11716 bytes
SHA-256: 6f1729a4aedd250dcd650e3bec7c423e51b893fe04387ed0d80a93978ed0bff7

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