Malicious PDF — malware analysis report

Static analysis result for SHA-256 d80ffdfb27000e93…

MALICIOUS

PDF

75.7 KB Created: 2020-11-25 14:34:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: a3a0fd34657a43ce40b256b275a83bbb SHA-1: 437e7ee756725e659581845d7465d18a815f8234 SHA-256: d80ffdfb27000e93457fe98de800c3016bfaa5bb5bdc1322ded5e557a939fe7c
156 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 as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://traffnew.ru/aws?utm_term=cursive+calligraphy+worksheets PDF link annotation
    • https://xufiwelak.weebly.com/uploads/1/3/1/1/131164558/rixunapokulobivukeve.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403940/normal_5f95cc2473d0d.pdfIn PDF document text
    • https://nukubutoti.weebly.com/uploads/1/3/2/3/132302768/7345950.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451762/normal_5fa55e231df6b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409256/normal_5fa209b813b62.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/1c78f5b6-cb13-4f15-b874-39ac15fe9406/jajamuvipobawaluwarog.pdfIn PDF document text
    • https://s3.amazonaws.com/jezekemunidup/excel_activesheet._range_autofilter_criteria.pdfIn PDF document text
    • https://s3.amazonaws.com/gixirojozogufux/free_snes_emulator_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/bisazabe/gerebol.pdfIn PDF document text
    • https://s3.amazonaws.com/gupawupigawono/larujevisewut.pdfIn PDF document text
    • https://s3.amazonaws.com/sakaburepagase/56642907179.pdfIn PDF document text
    • https://s3.amazonaws.com/leguvefu/85250286794.pdfIn PDF document text
    • https://s3.amazonaws.com/kozibowisenatu/2016_volkswagen_tiguan_owners_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/sasufufa/32021392662.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d534.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD534 5416 bytes
SHA-256: cd89dba8fe904c62eef74a588bdd26600a744a9e3f48abcdcfb3f85a058de85d
font_01_sfnt_off0000e7b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7B6 10860 bytes
SHA-256: 0a7469c369c29e28079fea0eda67e5aa0dd65e845843fb3f8c04ae2d51d11507
font_02_sfnt_off00010c9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C9C 16068 bytes
SHA-256: e7273338525a866f49bd556f13a0e46ce1e8513f85f175d9d987aa1f8b89adb9

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