Malicious PDF — malware analysis report

Static analysis result for SHA-256 553797e4cc233eb7…

MALICIOUS

PDF

66.8 KB Created: 2020-11-11 21:03:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 94346306a6de2880d20582a7dc9cc2ff SHA-1: 15519f82223526567f107a91c29517819c7b24a7 SHA-256: 553797e4cc233eb772c5cb4885d914d526d4d0d9c16bfc969b16ba5facbf0259
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious content. The PDF contains a large number of external links, many pointing to Weebly-hosted PDFs, suggesting a link farm or phishing campaign. One embedded URI, 'https://trafffe.ru/aws?utm_term=the+defilers+rep+guide+vanilla', is particularly suspicious and likely serves as a lure or initial point of contact for further malicious activity. No scripts were extracted, but the structure and numerous external links strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://trafffe.ru/aws?utm_term=the+defilers+rep+guide+vanilla PDF link annotation
    • https://zeleruzonupaza.weebly.com/uploads/1/3/4/3/134358533/mewiwemeli-pebufijiwem.pdfIn PDF document text
    • https://sofuwikomu.weebly.com/uploads/1/3/4/3/134308783/9218056.pdfIn PDF document text
    • https://zumavekuganupa.weebly.com/uploads/1/3/4/3/134366180/d52c970060.pdfIn PDF document text
    • https://wetuxabo.weebly.com/uploads/1/3/0/8/130873937/sefufizodofok.pdfIn PDF document text
    • https://lisajakuxateril.weebly.com/uploads/1/3/4/3/134349263/zunavukidibugo_raxiru_goguwemewule_budugen.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382631/normal_5f8da66f9589e.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/fekaduvopigab/lusisivujorogufogugil.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d8bfc28a-eb4f-47df-96bb-2ed797176d34/canciones_de_tinkerbell_1.pdfIn PDF document text
    • https://s3.amazonaws.com/sirasu/free_mercruiser_service_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9bfe1492-971f-43ec-9b8d-98f507fb9c9a/baxugakuwasatalufop.pdfIn PDF document text
    • https://s3.amazonaws.com/pajukovuxetu/zebanu.pdfIn PDF document text
    • https://s3.amazonaws.com/dalava/frigidaire_professional_series_oven_manual.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_off0000c810.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC810 5312 bytes
SHA-256: 6cd29548bb4c6575756cf8b4074d6aed5542483084359a88a44d7d73fe9a4762
font_01_sfnt_off0000da23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA23 10776 bytes
SHA-256: 90eb75b926f1cc9456bd6f0fc608ccf06fc0e2df5d15b65c668b50d19e31bed9

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