Malicious PDF — malware analysis report

Static analysis result for SHA-256 63bd81046f2f8e19…

MALICIOUS

PDF

79.8 KB Created: 2021-03-16 06:13:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 00c0af989d07fc99cb6111b07a0d5c60 SHA-1: e89f916a9c656e91064ed79595676aa3bf396ccb SHA-256: 63bd81046f2f8e1957bfcd800fadf9cd28a6cb2d17d8279255ee721a578ab1e9
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with several pointing to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the primary attack vector appears to be the embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://dafemum.ru/award?keyword=conduct+disorder+assessment+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4392853/normal_601b128d938b0.pdfIn PDF document text
    • https://sogatetemurus.weebly.com/uploads/1/3/4/3/134379625/5bade3cd.pdfIn PDF document text
    • https://rikodagipavas.weebly.com/uploads/1/3/4/3/134334006/vidotejeporiro.pdfIn PDF document text
    • https://nawexolaka.weebly.com/uploads/1/3/4/7/134704757/53bf623.pdfIn PDF document text
    • https://cdn.sqhk.co/fodibaniwe/ighfPgh/telugu_movies_2019_list_imdb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382965/normal_6036989a8c686.pdfIn PDF document text
    • https://lazumuron.weebly.com/uploads/1/3/4/8/134863931/zazusisikixek_dawazalovudu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365562/normal_5fe75c4b1165f.pdfIn PDF document text
    • https://cdn.sqhk.co/liregevo/1GQsIha/fobisida.pdfIn PDF document text
    • https://cdn.sqhk.co/gagadobuv/IeZzbha/jibij.pdfIn PDF document text
    • https://cdn.sqhk.co/xajevedu/6jggKnW/digicel_top_up_online_st_lucia.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372378/normal_603aa0adbe2e1.pdfIn PDF document text
    • https://fabedajigunud.weebly.com/uploads/1/3/4/4/134480588/8524203.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401712/normal_600fe85097b18.pdfIn PDF document text
    • https://dagaroxir.weebly.com/uploads/1/3/5/9/135973008/92c59b6f053.pdfIn PDF document text
    • https://vonuvevija.weebly.com/uploads/1/3/1/4/131407152/2748937.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/jazuravazaguz/fojefopesa.pdfIn PDF document text
    • https://s3.amazonaws.com/tisegovofu/69350268571.pdfIn PDF document text
    • https://s3.amazonaws.com/dipafuxe/scrabble_word_finder_cheat_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/gujutavevive/guidelines_esc_pregnancy.pdfIn PDF document text
    • https://s3.amazonaws.com/bubeto/10th_marksheet_2017_tamilnadu.pdfIn PDF document text
    • https://s3.amazonaws.com/lebaxa/royal_marines_bleep_test.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_off0000ed1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED1B 5172 bytes
SHA-256: 1dd7eb0ab41af20aaa89b01a56df48564bddfdb6edcf3469d1b4d91e69640fdc
font_01_sfnt_off0000fe99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE99 10912 bytes
SHA-256: 0a2c3418751951d1d37c72c96e3abf9e78c266284d81b1efa6d591cd076ce43b
font_02_sfnt_off000123e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123E6 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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