Malicious PDF — malware analysis report

Static analysis result for SHA-256 a14b7968966ea40f…

MALICIOUS

PDF

75.0 KB Created: 2021-01-22 17:07:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 9aec9577d335a5927bc14e7e4b7047c9 SHA-1: c502318e03c94b01071f875a70b9f99681d3b2c0 SHA-256: a14b7968966ea40fdedcf2d7774e8d1e2d8c4d9a903ffc03600a50dd3dcd9bc4
156 Risk Score

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 these links, https://leonvi.ru/123?utm_term=doritos+commercial+baby+first+word, is directly embedded in the document. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or distributing further malware through the linked PDFs.

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
  • 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://leonvi.ru/123?utm_term=doritos+commercial+baby+first+word PDF link annotation
    • https://site-1217437.mozfiles.com/files/1217437/51226974428.pdfIn PDF document text
    • https://site-1176636.mozfiles.com/files/1176636/51938374460.pdfIn PDF document text
    • https://lonaxixa.weebly.com/uploads/1/3/1/4/131413275/3585270.pdfIn PDF document text
    • https://site-1171153.mozfiles.com/files/1171153/herpes_simplex_2_antibody_test.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/pukiza/36337556209.pdfIn PDF document text
    • https://s3.amazonaws.com/genukopapovixo/balwinder_sandhu_information_in_marathi.pdfIn PDF document text
    • https://s3.amazonaws.com/sogovekevi/55631260929.pdfIn PDF document text
    • https://s3.amazonaws.com/didowugorokirug/lifaxolelexitazuzoxifo.pdfIn PDF document text
    • https://s3.amazonaws.com/tutapaxi/watch_anime_ultimate_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/jeromopelurab/9571594847.pdfIn PDF document text
    • https://s3.amazonaws.com/watajive/20309967891.pdfIn PDF document text
    • https://s3.amazonaws.com/juvetaso/dotajapilekotulivadon.pdfIn PDF document text
    • https://s3.amazonaws.com/sorogamat/alphabet_espagnol_prononciation.pdfIn PDF document text
    • https://s3.amazonaws.com/mibiwivanetuj/badnaamiyan_mili_audio_song.pdfIn PDF document text
    • https://s3.amazonaws.com/wuzalugiseto/paediatric_assessment_form_physiotherapy.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_off0000e6d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6D4 5500 bytes
SHA-256: 3867b66970254c17d504d50c1a7463b1124cd3cc420949a29b6bdd500b1a2730
font_01_sfnt_off0000f988.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF988 10912 bytes
SHA-256: 13e5aaa826b67bbb005bf1db8239a622f30515cb10143b6ffdaf6485fca9308a

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