Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e19b173ddf439c4…

MALICIOUS

PDF

64.7 KB Created: 2020-12-14 22:47:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 41e9ef7be78683d60a79f8fd27f9755d SHA-1: baef92bbe868e89eca661a95d82996f9b8c9ced7 SHA-256: 1e19b173ddf439c43c038eb9ac127cd59bdc0665624f3c51b3b8efe9f7e8dad9
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a significant number of external links, with one pointing to 'trafffi.ru', suggesting a phishing or link-farming attempt. The ClamAV detection and ML classifier also indicate maliciousness. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of malicious intent, likely related to spearphishing.

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://trafffi.ru/123?utm_term=fermi+level+of+metals PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4384320/normal_5f97908462859.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4428038/normal_5fa0a0c3502a7.pdfIn PDF document text
    • https://tixonanixob.weebly.com/uploads/1/3/4/8/134890866/xatuli.pdfIn PDF document text
    • https://bopetibalat.weebly.com/uploads/1/3/4/8/134891962/3499270.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/pomaxa/blank_certificate_of_origin_form.pdfIn PDF document text
    • https://s3.amazonaws.com/remeranexe/fepisasagejatejitibume.pdfIn PDF document text
    • https://s3.amazonaws.com/pujinit/nipatikuzorejip.pdfIn PDF document text
    • https://s3.amazonaws.com/leguvefu/pin_diode_construction_and_working.pdfIn PDF document text
    • https://s3.amazonaws.com/xovekolamoxe/addendum_template_for_policy.pdfIn PDF document text
    • https://s3.amazonaws.com/bawalidamovidud/speak_now_1_teacher_s_book_download.pdfIn PDF document text
    • https://s3.amazonaws.com/polexebuj/jaxazoxogare.pdfIn PDF document text
    • https://s3.amazonaws.com/davubewu/wavolupomelejulanunovofoj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/64bad122-bf55-4e9f-98a2-3530b2ea22df/200_forest_ave_medford_nj.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_off0000c1a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1A9 4928 bytes
SHA-256: 4f67f0f03ed6a4f4d8468482dbcd4004f23abd88b3c4c9db967be97f3caf68da
font_01_sfnt_off0000d25a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD25A 10480 bytes
SHA-256: 8823ac44712a0d968eb19cd5f703fc1faea9892d37b455f902f484c859425268

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