Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a26977332cdb532…

MALICIOUS

PDF

68.2 KB Created: 2020-12-21 18:03:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: ba423f153dcd33a3d26c7e733dc61def SHA-1: 1d55bcddced58a907faefc9c79f66ef40158ee3e SHA-256: 3a26977332cdb5327746f1e3c59c98845cf67f8bfe2014a4e011dcba27265c42
214 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, with one identified as a malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The document body, though heavily obfuscated, suggests a lure related to 'Grammar in use pdf'. No scripts were extracted, but the embedded URLs are the primary indicators of compromise.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://ggtraff.ru/aws?utm_term=grammar+in+use+pdf+tieng+viet In PDF document text
    • https://cdn-cms.f-static.net/uploads/4387807/normal_5fbad6ccdc1c4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379961/normal_5fbc8c55ac729.pdfIn PDF document text
    • https://lovarewido.weebly.com/uploads/1/3/4/3/134322716/b851521ef96ac.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375070/normal_5fb29e4d4f0dd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413373/normal_5fc953e153759.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411489/normal_5fcf5c6730b47.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4497110/normal_5fde23653be53.pdfIn PDF document text
    • https://ditiwudo.weebly.com/uploads/1/3/1/4/131452947/xalibudi_vited_potofesazad_kodenubos.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4463300/normal_5fc552ed3d3a1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418778/normal_5fbd484dd0806.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/bezegoluzose/witipokiwakonaxasor.pdfIn PDF document text
    • https://s3.amazonaws.com/voxazedisula/google_remote_desktop_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/badodemebo/zopugalutaza.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_off0000cc58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC58 5420 bytes
SHA-256: e7b888e0e06965b843a708dacf650409638b5882c55820c7286d6d9c2374ba41
font_01_sfnt_off0000dec1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEC1 10668 bytes
SHA-256: 8acd35958e52d83f27f68f932d1c0c07259519ca7ac1192099dfe0d617b1b0f9

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