Malicious PDF — malware analysis report

Static analysis result for SHA-256 d21543b1ddd2dbe3…

MALICIOUS

PDF

95.6 KB Created: 2021-03-30 05:45:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: a654403a945ba755a280ef545b93b29e SHA-1: 9f1021387e36e52e569f8cdd66a3aa1f7325595f SHA-256: d21543b1ddd2dbe3fc529e2d609a1efb6a8bda745872b18ad627ceb99e0df2b7
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which are to PDF files, suggesting a link farm or SEO spam campaign. The ClamAV detection and ML classifier indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the presence of numerous external links points to an attempt to redirect users to potentially malicious content.

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 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.
  • 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://bologen.ru/wix?keyword=inscription+leveling+guide+1-300 PDF link annotation
    • https://cdn.sqhk.co/tumowara/fhbtAhf/74063626664.pdfIn PDF document text
    • https://lejonelawubuw.weebly.com/uploads/1/3/1/4/131453657/fotidijer_vinulaw_xewisarov.pdfIn PDF document text
    • https://wuwotozon.weebly.com/uploads/1/3/4/3/134315251/detabasovadilinako.pdfIn PDF document text
    • https://mixusabap.weebly.com/uploads/1/3/4/0/134096097/770b9f3.pdfIn PDF document text
    • https://nivikaxixigimom.weebly.com/uploads/1/3/5/3/135322477/be3ccf9b289ba.pdfIn PDF document text
    • http://josumewemuzob.getenjoyment.net/50824460618.pdfIn PDF document text
    • https://bunafigokakataw.weebly.com/uploads/1/3/0/9/130969192/6351740.pdfIn PDF document text
    • http://acupofjacob.com/34769600522jqnpg.pdfIn PDF document text
    • https://cdn.sqhk.co/denalivek/jaOeNhc/xolibetom.pdfIn PDF document text
    • http://golixudib.mypressonline.com/10194561459.pdfIn PDF document text
    • http://karnaval.host/d_d_character_sheet_ipadv8e2s.pdfIn PDF document text
    • https://cdn.sqhk.co/nonuripot/fYjcyhb/my_talking_tom_mod_apk_app_download.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://9907981b-0bc7-4fd3-a434-169f7cdadf42.filesusr.com/ugd/575363_d9a1cc29bc8f44d29a57873d3f629e4d.pdf?index=trueIn PDF document text
    • https://e809654a-a95b-4dbc-a338-24085255a2f8.filesusr.com/ugd/1b6cec_f322536704d241c2ad671466fa3aa710.pdf?index=trueIn PDF document text
    • https://00407fa8-a9ef-4b78-9bbe-46147fc8acf6.filesusr.com/ugd/5ecadc_eed6f3356fef4c27a20ed4bc850f5512.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/diwitapezu/install_whatsapp_apk_di_blackberry_os_10.pdfIn PDF document text
    • https://s3.amazonaws.com/regovadeje/number_line_printable.pdfIn PDF document text
    • https://s3.amazonaws.com/bajapovogam/xujisujuwemefumaba.pdfIn PDF document text
    • https://s3.amazonaws.com/visagogijulep/pride_and_prejudice_volume_2_chapter_18_summary.pdfIn PDF document text
    • https://s3.amazonaws.com/muxozuvalubi/wutenovovigewuwipe.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_off0001397d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1397D 5420 bytes
SHA-256: 68673fb84e956d2c73ece42d50b3338139c1fb0cf949be8842df069daff5de6e
font_01_sfnt_off00014c14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C14 10920 bytes
SHA-256: ed7b5f8a5b8d043d455eaffd672c17a9c1ff23000788ffc9c5cd5df468e20af3

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