Malicious PDF — malware analysis report

Static analysis result for SHA-256 f40764f0a4fdd728…

MALICIOUS

PDF

74.3 KB Created: 2021-02-21 18:59:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: c31c5b27071dc8653ebd22371f871941 SHA-1: d4fc0fefc14ee3359d50cb4846003e0c2c9be183 SHA-256: f40764f0a4fdd728d56ede653847464b19830b98f808087b5aa14cbe27ac09ff
214 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one heuristic specifically identifying it as a PDF link farm. The primary malicious URL, https://yafferge.ru/wix?keyword=hedgehog+color+guide, is flagged as a redirector to malicious infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or SEO spam.

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=hedgehog+color+guide In PDF document text
    • https://cdn.sqhk.co/gusisitixinu/hdGf5vg/73278901389.pdfIn PDF document text
    • https://cdn.sqhk.co/nemisova/OihjgFj/3d_origami_patterns.pdfIn PDF document text
    • https://ladunibik.weebly.com/uploads/1/3/4/0/134096621/famasupowataxupukib.pdfIn PDF document text
    • http://dutuvowori.22web.org/amazing_facts_in_telugu.pdfIn PDF document text
    • https://cdn.sqhk.co/nugunexinazo/ihiJKie/wudugari.pdfIn PDF document text
    • http://fanexaxujuto.22web.org/71439918488.pdfIn PDF document text
    • http://berilunowalaz.iblogger.org/us_visa_form_from_pakistan.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gumupomomoripu.rf.gd/printable_address_book_free.pdfIn PDF document text
    • https://s3.amazonaws.com/viwoxuz/nomusifututilamawaw.pdfIn PDF document text
    • http://fobapisarut.epizy.com/phenolphthalein_naoh_kinetics_lab_report.pdfIn PDF document text
    • https://s3.amazonaws.com/lizuseguwix/lelana.pdfIn PDF document text
    • http://bakenexiradofo.epizy.com/57638394249.pdfIn PDF document text
    • https://s3.amazonaws.com/sizadagazagaj/adverbial_and_adjectival_clause_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/woberiz/ximomenanozazakivi.pdfIn PDF document text
    • http://zuxekesimulir.epizy.com/constraintlayout_guideline_begin.pdfIn PDF document text
    • https://s3.amazonaws.com/lomiwexuva/kobobisuderutilarivuxido.pdfIn PDF document text
    • https://s3.amazonaws.com/musokejixami/63287807004.pdfIn PDF document text
    • http://wafubarig.epizy.com/70482753117.pdfIn PDF document text
    • http://vagakidid.epizy.com/how_do_i_know_if_my_neff_oven_is_self-cleaning.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_off0000e75d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE75D 4776 bytes
SHA-256: b34663e121e1e5b79b721d635161441b8764a2110186ed3ccdad81751da87581
font_01_sfnt_off0000f78f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF78F 10704 bytes
SHA-256: a6e5552072d057c3bfa79290cbef40616482247805ff67b74f9e56da07b6a57b

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