Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5956fd9b6726f58…

MALICIOUS

PDF

76.8 KB Created: 2021-02-17 06:18:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 235ab69b03f0935dc7942e4a9a2922e2 SHA-1: 6919c9174b9201fe5a2e8904d8a7f400a95301fe SHA-256: c5956fd9b6726f5813dd60b572a9e85201b90ef45a93544be53bb4276e8a4ace
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, identified as a 'link farm', suggesting a phishing or SEO poisoning attempt. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically classifying it as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and numerous external URLs point towards an attempt to redirect users to malicious sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://baarspo.ru/strik?utm_term=magic+bullet+blender+warranty PDF link annotation
    • https://cdn.sqhk.co/fewukise/bijEicY/astral_lucky_block_race_popularmmos.pdfIn PDF document text
    • https://jozokuxig.weebly.com/uploads/1/3/2/8/132814463/xutigojobi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471106/normal_5fe99bbdebd36.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4390659/normal_5ffa397492af2.pdfIn PDF document text
    • https://nogekapufininut.weebly.com/uploads/1/3/3/9/133997605/e4420ae12.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366639/normal_5ffc37cc7a77b.pdfIn PDF document text
    • https://cdn.sqhk.co/nonuripot/RrJdibG/kingsland_punch_and_shear.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4468531/normal_5fec161c63252.pdfIn PDF document text
    • https://tumurotijom.weebly.com/uploads/1/3/4/5/134512141/vasuzalexanebofel.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427287/normal_60225b686285f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451565/normal_600af0ab365da.pdfIn PDF document text
    • https://kitopelok.weebly.com/uploads/1/3/4/3/134355781/367525.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403687/normal_5fcf7309e98bc.pdfIn PDF document text
    • https://cdn.sqhk.co/sidogorego/igmD39W/equalizer_apo_music_presets.pdfIn PDF document text
    • https://cdn.sqhk.co/natefisaka/Hik8jdG/free_antivirus_software_for_android_phone.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4389370/normal_60005bb6e67a9.pdfIn PDF document text
    • https://cdn.sqhk.co/tazifawixax/eidL3gj/mezezajisari.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/bizamesuwepe/adverbs_exercises_with_answers_for_grade_6.pdfIn PDF document text
    • https://s3.amazonaws.com/jivamubug/fepogoxotapuwaraba.pdfIn PDF document text
    • https://s3.amazonaws.com/jinabisura/top_paid_apps_android_2019.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_off0000df43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF43 5040 bytes
SHA-256: 565c4e3b67cbaeaa4c86d3600e1307260f00b9101ca8b2b88c809ee4cd371ff2
font_01_sfnt_off0000f083.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF083 11320 bytes
SHA-256: e063bce963e5689d3a9dc465d545a6204e313c5fd30192367a30ac9e5231e6ec
font_02_sfnt_off0001173e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1173E 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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