Malicious PDF — malware analysis report

Static analysis result for SHA-256 051b8c6ca1fd9265…

MALICIOUS

PDF

83.1 KB Created: 2021-03-19 06:02:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 72d8224f09eefe0db232a786e97755ea SHA-1: bb74d56e6ff01fed918b3a0f03d534a699d2a396 SHA-256: 051b8c6ca1fd926515fb07a65857c67cac6ef3f85395bc6c2850adfe337361b7
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous external links, with one heuristic specifically identifying it as a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded URLs point towards a malicious document designed to redirect users to potentially harmful sites.

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://golowaki.ru/award?keyword=database+examples+pdf PDF link annotation
    • http://svarka-aurora.online/what_to_write_in_the_first_page_of_your_diaryg6j9h.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420600/normal_604f9874072aa.pdfIn PDF document text
    • https://cdn.sqhk.co/povewepalu/1SfjjRd/50085050193.pdfIn PDF document text
    • https://cdn.sqhk.co/fokigegoma/Jie0Yjg/pesotedefijekifugo.pdfIn PDF document text
    • http://opticsystem.website/chores_planner_template7p0ip.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414173/normal_604a6786c8d0d.pdfIn PDF document text
    • http://health-top.ru/gitejotitorunesupidikohbe22.pdfIn PDF document text
    • http://winoraama.website/gufixasosedatogiparcno42.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379984/normal_5fd61d255e71d.pdfIn PDF document text
    • http://tryici.xyz/how_to_use_pellon_interfacinga8j80.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486374/normal_601420adc17c6.pdfIn PDF document text
    • http://instapodarok365.site/71136362342i0cjo.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://c2267750-1f6d-4c2f-944a-eb302c7f07d7.filesusr.com/ugd/93971e_1cfa8695666f4a16bb68fed58541d99d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/mudurixo/fufanate.pdfIn PDF document text
    • https://b20aee1f-b1b7-4e4e-be5e-d884e4ece670.filesusr.com/ugd/10e3af_2eaf25b09333446f89b7306702cef8e5.pdf?index=trueIn PDF document text
    • https://6a24fdd2-d4a5-4c4b-882b-0f3115751bcf.filesusr.com/ugd/04e6f9_a4fe829e2b554f3080e3a52344da0c32.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/farefasejikap/20139934888.pdfIn PDF document text
    • https://s3.amazonaws.com/gavobawum/winter_serenade_yamaha_piano_sheet_music.pdfIn PDF document text
    • https://7f1888b6-cdab-4603-9914-1cf81a8b29aa.filesusr.com/ugd/6846fe_1d3e3dec90cc4fe888019e2443a5670b.pdf?index=trueIn 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_off0000fb08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB08 4824 bytes
SHA-256: 7de11b6724a066603e42b66aa778de817bf4e754b8763e595a290dbf6a72780b
font_01_sfnt_off00010b73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B73 11044 bytes
SHA-256: fc9838a83269db417b27b60e232dd218d7337634cf90cfcd5e8c2eb16c6f63fa
font_02_sfnt_off00013100.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13100 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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