Malicious PDF — malware analysis report

Static analysis result for SHA-256 31a44fe4d4bb31ad…

MALICIOUS

PDF

73.6 KB Created: 2021-02-18 07:55:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 604eff488e8a130180ea63613152d225 SHA-1: 201d21d46474377ad3d05dcfc75c2d89057c85ce SHA-256: 31a44fe4d4bb31ad1ab76ffc5c0eb7ff36de251381be5a8b9957937f8a67dd43
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 and a link farm, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded content, though heavily obfuscated, appears to be related to cracking safes, serving as a lure to entice users to click on the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://yafferge.ru/wb?keyword=how%20to%20crack%20open%20a%20digital%20sentry%20safe In PDF document text
    • https://kefexogutifega.weebly.com/uploads/1/3/5/3/135309882/pojatofamuk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447906/normal_602bdf96dc143.pdfIn PDF document text
    • https://cdn.sqhk.co/baruduwege/JieHlgd/management_leadership_skills_planning_execution_assessment.pdfIn PDF document text
    • https://mututekabifu.weebly.com/uploads/1/3/4/4/134466573/7b8c370803d64.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459318/normal_5fca8b0891974.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501654/normal_600dd79490966.pdfIn PDF document text
    • https://cdn.sqhk.co/zimajigon/Yjc1xic/lifatobatot.pdfIn PDF document text
    • https://cdn.sqhk.co/fadejiweruw/Okngjij/kitafusole.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445880/normal_5fd2da128daad.pdfIn PDF document text
    • https://midubumiw.weebly.com/uploads/1/3/5/9/135989619/9205633.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419633/normal_5feaeb3507a9b.pdfIn PDF document text
    • https://cdn.sqhk.co/wosepimi/bduT2ha/20935136909.pdfIn PDF document text
    • https://javogukurajukip.weebly.com/uploads/1/3/4/2/134235542/7b7698d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4390383/normal_5fe44a3d51de3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467300/normal_602dcde45c4d0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/vebisop/37108607380.pdfIn PDF document text
    • https://s3.amazonaws.com/mubemutolewe/jusojasagewebozuwimurit.pdfIn PDF document text
    • https://s3.amazonaws.com/nalifij/75306860650.pdfIn PDF document text
    • https://s3.amazonaws.com/migivewuwe/73871752330.pdfIn PDF document text
    • https://s3.amazonaws.com/buponuwebi/free_google_calendar_template_2018.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d4f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4F4 5332 bytes
SHA-256: 71916030681286452643fd6cc2e39c1a7e81e7bb5904250c35da748c98364f34
font_01_sfnt_off0000e737.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE737 10380 bytes
SHA-256: 817d86b2edd4b9847cbbe1b007538b6cf223fb5502f27183440c8263e6eea655
font_02_sfnt_off00010a86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A86 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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