Malicious PDF — malware analysis report

Static analysis result for SHA-256 ddebe31d31c96af5…

MALICIOUS

PDF

80.4 KB Created: 2021-01-21 13:47:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 6596d577ebfe44f20953ba75409e9ad7 SHA-1: e9c7770077eecf727d61190ff94e5018d707663b SHA-256: ddebe31d31c96af56fbe305124074a07a5685081024c7cfba067dd9e340c7464
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, flagged as a 'PDF_SEO_LINK_FARM', suggesting a malicious intent to direct users to potentially harmful websites. The ML classifier and ClamAV detection strongly indicate maliciousness. While no scripts were explicitly extracted, the presence of embedded URLs and the overall structure point towards a phishing or malware distribution scheme disguised as a document resource.

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://seumenha.ru/aws?utm_term=free+cursive+writing+alphabet+practice+sheets PDF link annotation
    • https://cdn.sqhk.co/zivunegas/Qghicjl/76012012280.pdfIn PDF document text
    • https://cdn.sqhk.co/jememobak/jFgimgf/the_hangover_part_iii_album_songs.pdfIn PDF document text
    • https://cdn.sqhk.co/sanevujaguda/fTE9Yhc/1057337341.pdfIn PDF document text
    • https://xewulowew.weebly.com/uploads/1/3/4/7/134757629/firefil.pdfIn PDF document text
    • https://cdn.sqhk.co/jawubibegeba/hijhTyd/walivuwezovuxewu.pdfIn PDF document text
    • https://cdn.sqhk.co/rodisukipi/gfo89aM/51650638453.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/juduk/kezotelemireronimema.pdfIn PDF document text
    • http://kodadus.epizy.com/cisco_packet_tracer_6._2_netacad.pdfIn PDF document text
    • https://s3.amazonaws.com/kakekojezutok/manorama_year_book_2018_english.pdfIn PDF document text
    • https://s3.amazonaws.com/wefadep/zokuxodipiruzat.pdfIn PDF document text
    • https://s3.amazonaws.com/werowibovezoje/xunajotowet.pdfIn PDF document text
    • https://s3.amazonaws.com/gogunabones/birixiwokugikusoxi.pdfIn PDF document text
    • http://jolasesiv.epizy.com/36704228345.pdfIn PDF document text
    • https://s3.amazonaws.com/pigolo/87867457640.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_off0000fd8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD8D 5440 bytes
SHA-256: f5b59504a4db4990d1745bbedbcdcd92798e524ee2a6a666b41c873dfc634019
font_01_sfnt_off0001101e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1101E 10768 bytes
SHA-256: d5193437bcabb150097d963cda474574c62aa28d519c02ae4c93ea1e5fd5ab1d

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