Malicious PDF — malware analysis report

Static analysis result for SHA-256 e49b807e7cd0d8b5…

MALICIOUS

PDF

87.7 KB Created: 2020-12-25 23:44:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: b1f9331850bbaf6004670ec164a1e84e SHA-1: 1b6c4b6e9a9f97b037e796f2550e2496da8ed55f SHA-256: e49b807e7cd0d8b592254641ab77f588deff6c62045a0b98dcfd0d4f713a2784
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://trafficel.ru/strik?utm_term=banco+bradesco+numero+237 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4411219/normal_5fb4b087c0a69.pdfIn PDF document text
    • https://japiravonasuv.weebly.com/uploads/1/3/4/6/134644749/ab69b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461481/normal_5fafb5eccbc26.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481157/normal_5fde2d9ab232b.pdfIn PDF document text
    • https://ginabedo.weebly.com/uploads/1/3/4/0/134017532/0973d47354.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384469/normal_5fbc045db0f3c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465257/normal_5fbdc1978620c.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/fogibi/huron_county_sheriff_glyph_reports.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/783e2235-4ab9-4398-94e1-cd2a48eedc61/chemistry_lab_report_example.pdfIn PDF document text
    • https://s3.amazonaws.com/xutomoxu/whatsapp_new_version_2017_for_android.pdfIn PDF document text
    • https://s3.amazonaws.com/zerepuzuze/4108170381.pdfIn PDF document text
    • https://s3.amazonaws.com/xuxifuzituwu/betapakolitil.pdfIn PDF document text
    • https://s3.amazonaws.com/magapeguwabe/real_gangster_crime_game_uptodown.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7848364a-e8df-4445-a617-e51b97ea0719/direct_financial_loan_center_royal_oak.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f3a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3A2 5620 bytes
SHA-256: 9fb79f289545bdd8305ca1a2535cb6509c82f6f5d72fe2fab2a9b377523a8b27
font_01_sfnt_off00010697.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10697 1800 bytes
SHA-256: daad3f347a4f42f432ee9983e619a7c063e36761dba5934b469418034847e28e
font_02_sfnt_off00010f25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F25 13568 bytes
SHA-256: 10506ae99a46a2aece4438afba64de8fec6e671a137aa923f4deb1d83d93adda
font_03_sfnt_off000139c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139C8 16376 bytes
SHA-256: 684a3c196e802b4dc45ee85e0d12f41c83d6b6c6a55a83cec5fb8e332ee9aa36

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