Malicious PDF — malware analysis report

Static analysis result for SHA-256 16c8276d772be55b…

MALICIOUS

PDF

91.8 KB Created: 2021-01-23 12:33:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: b0203f8a4d5d512c59335d47504eea6c SHA-1: 479693d35bbd4542b6c35b78a718b2514c188939 SHA-256: 16c8276d772be55bcce4945454f481cde16e46ec299d13aead65a62d85bfa2cf
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 by the PDF_SEO_LINK_FARM heuristic, pointing to various PDF files. One of the primary external links, https://trafffe.ru/123?utm_term=acidos+nucleicos+cuales+son, is flagged as unknown reputation and is likely part of a malicious campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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/123?utm_term=acidos+nucleicos+cuales+son PDF link annotation
    • https://petizigosi.weebly.com/uploads/1/3/4/9/134903326/4711965.pdfIn PDF document text
    • https://gozexorajive.weebly.com/uploads/1/3/4/6/134610068/20d5f6f.pdfIn PDF document text
    • https://site-1195137.mozfiles.com/files/1195137/dalozo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383586/normal_5fe6f7d264b4b.pdfIn PDF document text
    • https://zesadokalefon.weebly.com/uploads/1/3/2/6/132681767/pokomu-wukesofo.pdfIn PDF document text
    • https://tunozuranoba.weebly.com/uploads/1/3/5/3/135316660/660fe44c4497.pdfIn PDF document text
    • https://site-1190334.mozfiles.com/files/1190334/best_hits_of_the_80s_youtube.pdfIn PDF document text
    • https://site-1192291.mozfiles.com/files/1192291/magirigi.pdfIn PDF document text
    • https://jewelilug.weebly.com/uploads/1/3/4/3/134331877/ca46124abd0234.pdfIn PDF document text
    • https://site-1171826.mozfiles.com/files/1171826/marshalls_careers_indeed.pdfIn PDF document text
    • https://site-1177116.mozfiles.com/files/1177116/xuvunoburupirekokazil.pdfIn PDF document text
    • https://zafasasuk.weebly.com/uploads/1/3/4/7/134713251/lojovibofezu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4392869/normal_5feeb958bf499.pdfIn PDF document text
    • https://jigaposu.weebly.com/uploads/1/3/5/3/135397088/butobuti.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449783/normal_5fd6765ab30c8.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/fosalizuzu/google_admob_sdk_ios.pdfIn PDF document text
    • https://s3.amazonaws.com/remufuzu/xomumipuxisifuka.pdfIn PDF document text
    • https://s3.amazonaws.com/zabevog/67490069590.pdfIn PDF document text
    • https://s3.amazonaws.com/rojalexipokadaz/insect_glaive_armor_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/xamibudasagas/bs_standard_for_transformer.pdfIn PDF document text
    • https://s3.amazonaws.com/dudigonifu/computer_organization_and_architecture_books_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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001196a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1196A 4628 bytes
SHA-256: 22d443472f5be1f20535ebd1ec75f8206ca4b0c21baeb4cdb615705285940902
font_01_sfnt_off0001291a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1291A 12684 bytes
SHA-256: ebbb65deac2ffdeaaabd83a754d2a31c3e54abcadc703422bded07ba8d28f10b
font_02_sfnt_off000151ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x151FF 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230

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