Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb23b176b0e7b3f6…

MALICIOUS

PDF

73.2 KB Created: 2021-02-17 00:43:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 0a400df05f407033fc4f3812ef9e55af SHA-1: b997373b83a3338d31930f47106a26119a098e98 SHA-256: eb23b176b0e7b3f6c6ae459f0723db2d5e69d25ea665eb7b3ac471609fac69f2
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to external PDF files, indicating a link farm for SEO manipulation or phishing. One critical heuristic identified a link to a known malicious redirector at 'https://yafferge.ru/wix?keyword=keyboard+symbols+word+whizzle+answers'. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

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://yafferge.ru/wix?keyword=keyboard+symbols+word+whizzle+answers In PDF document text
    • https://static.s123-cdn-static.com/uploads/4467589/normal_5ff249d6d36e3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4496602/normal_5feb973d20191.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475725/normal_5fecf496d91a9.pdfIn PDF document text
    • https://ketawisu.weebly.com/uploads/1/3/1/4/131454029/8793851.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376379/normal_5fda156620d9a.pdfIn PDF document text
    • https://vetetomo.weebly.com/uploads/1/3/4/0/134000119/4325308.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401989/normal_601de571eaf8a.pdfIn PDF document text
    • https://ferofetilusef.weebly.com/uploads/1/3/5/3/135346026/3400798.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481286/normal_600a58b6170fa.pdfIn PDF document text
    • http://tesidakikize.iblogger.org/dipetozalulurit.pdfIn PDF document text
    • http://italywow.space/chevy_traverse_2018_user_manualm0bil.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388814/normal_600baa045505d.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/doxifuba/metro_ui_bootstrap_template_free.pdfIn PDF document text
    • https://s3.amazonaws.com/sugosubexez/imagine_beatles_piano_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/jupevuxirapi/48710166428.pdfIn PDF document text
    • https://s3.amazonaws.com/zedudo/sound_dampening_foam_sheets.pdfIn PDF document text
    • http://letugupinuvanu.rf.gd/65040002662.pdfIn PDF document text
    • https://s3.amazonaws.com/lurutopobi/definition_of_language_by_linguists.pdfIn PDF document text
    • http://wonenuw.epizy.com/wedding_reception_schedule_of_events_template.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_off0000e22c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE22C 5416 bytes
SHA-256: 8bd41fb14edfa0166bb49aa9dd1f0f43741f4c21bc2bb6461ef37bc43804ef2a
font_01_sfnt_off0000f48d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF48D 10148 bytes
SHA-256: 36a9c59a1eee266a781f97e330c66aa120f550cc8424bca174dfa4c85a473a49

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