Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe933f4aa3f3588e…

MALICIOUS

PDF

95.4 KB Created: 2020-11-26 10:41:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 9eac96e23435edb6cafc4a1f38676aa8 SHA-1: 378af198640ffc17a46527c3a82c7709c45bcd8d SHA-256: fe933f4aa3f3588eb40c4310ea8ac0c1535c0885e787c6b7cbb8f3cff727c697
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or phishing operation. The document body is heavily obfuscated and contains metadata indicating it was generated by wkhtmltopdf, a tool often used to create SEO spam or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://traffset.ru/123?utm_term=escudo+de+honduras+y+sus+partes PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4385038/normal_5f8eb15f7051e.pdfIn PDF document text
    • https://porimejonawi.weebly.com/uploads/1/3/4/3/134368737/cd47090fff8e0.pdfIn PDF document text
    • https://xataramev.weebly.com/uploads/1/3/4/3/134320843/fewuwefuvufu.pdfIn PDF document text
    • https://tegugozitofo.weebly.com/uploads/1/3/0/8/130874592/3969f5b0f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487903/normal_5fb0449b7f2fb.pdfIn PDF document text
    • https://bizumoku.weebly.com/uploads/1/3/2/6/132681494/femidi.pdfIn PDF document text
    • https://bawuzuxagoju.weebly.com/uploads/1/3/4/3/134340420/fizafu.pdfIn PDF document text
    • https://gobumireg.weebly.com/uploads/1/3/1/3/131383916/tikisiruvevaxa-buveret-zavolosusedub-nuzokejugaboga.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/kakekojezutok/928418962.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d72f929e-0902-4c0f-b34b-80726c57e56b/dajupajuxawawelifubeza.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/99025073-4bb4-4f37-8d10-bec0d154dcbe/36653549233.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e2d05bce-fa32-44bd-af57-3b212430cb50/68651579254.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ba75ca9e-e330-4fb5-9c1e-6f1f64bdcce5/words_with_prefixes_and_suffixes_3rd_grade.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9fe303fd-367d-4106-8ae0-01540b1c4c7d/toliss_a319_american_livery.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_off000136d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136D9 5188 bytes
SHA-256: eda48759d08e34949f00fb696ea70794a0337d08306eb42e3a1a2b29aaa46557
font_01_sfnt_off00014887.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14887 11672 bytes
SHA-256: 85ee5b628d4501e38ade0d8d9fcb421ccffcd679d141c5cd6fc397ba7f54daf7

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