Malicious PDF — malware analysis report

Static analysis result for SHA-256 a874a68dd2d90ee2…

MALICIOUS

PDF

72.7 KB Created: 2021-02-17 15:52:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: f02d8f5691e919204d468df73d646cf2 SHA-1: 4c7d6755ca678c559648563369558456753e8740 SHA-256: a874a68dd2d90ee2d9025e85a0e5706e56b78a342a936451c5b6d0c63aec6e57
164 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 by a machine learning classifier and ClamAV as malicious, exhibiting characteristics of a phishing lure. It contains numerous external links, many pointing to PDF files, suggesting a link farm or a mechanism to redirect users to malicious content. The presence of embedded URLs and the 'Fake invoice / payment lure' heuristic indicate an attempt to trick the user into clicking on a link, likely to download a second-stage payload or visit a phishing site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://seumenha.ru/aws?utm_term=freelance+writing+jobs+in+india+work+from+home PDF link annotation
    • https://cdn.sqhk.co/lupobikud/cjckm8y/jezupunofivofumotelusovoj.pdfIn PDF document text
    • https://xajerunufunofe.weebly.com/uploads/1/3/1/3/131378991/ad48a87b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470975/normal_601062e840831.pdfIn PDF document text
    • https://cdn.sqhk.co/xilasexiki/hvyuDv2/gutschein_amazon_kaufen_lidl.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445731/normal_601f1ebb50c23.pdfIn PDF document text
    • https://sozatoma.weebly.com/uploads/1/3/4/4/134484551/xetuwudetu_bolisola.pdfIn PDF document text
    • https://gekuxufetog.weebly.com/uploads/1/3/1/3/131384115/400967.pdfIn PDF document text
    • https://cdn.sqhk.co/lerapuraroke/ie0d5hf/stickman_dismounting_2.pdfIn PDF document text
    • https://cdn.sqhk.co/javukapegami/ibgf0HI/zikufirenopi.pdfIn PDF document text
    • https://xufefizomuziz.weebly.com/uploads/1/3/5/3/135346589/e376b92.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/jaloto/31740882905.pdfIn PDF document text
    • https://s3.amazonaws.com/sizadagazagaj/bass_guitar_exercises_for_dummies.pdfIn PDF document text
    • https://s3.amazonaws.com/vavejijitatofu/64261993602.pdfIn PDF document text
    • https://s3.amazonaws.com/tumuzu/momugak.pdfIn PDF document text
    • https://s3.amazonaws.com/jusagi/59947252941.pdfIn PDF document text
    • https://s3.amazonaws.com/wegemebufojafak/weather_report_fernandina_beach_florida.pdfIn PDF document text
    • https://s3.amazonaws.com/sejakopa/find_books_online_free.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_off0000db6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB6E 5764 bytes
SHA-256: ef34bbdd8fa02cd8b27cdfe192848c8b3e8707e19fcbc3915a4031c0d6edf9bf
font_01_sfnt_off0000eef4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEF4 11276 bytes
SHA-256: 1391e3bda6a62f198b4d30d0de7f1104b0ac77226c585060665875b4a6770ff9

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