Malicious PDF — malware analysis report

Static analysis result for SHA-256 879687c106cd4805…

MALICIOUS

PDF

73.6 KB Created: 2021-01-01 07:53:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 7ef26672c0425bedfb2cc2bfd6aca56b SHA-1: 4ae05370b74b5a781df9696665c3209d16877a81 SHA-256: 879687c106cd4805c0ed1dc945241772a3f6262b94c497fb0c3b2d3bc81ae0d1
156 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by a machine learning classifier and ClamAV, indicating a phishing or trojan threat. It contains a large number of external links, many pointing to potentially malicious domains, suggesting a link farm or redirection scheme. The embedded URLs and the overall structure point towards an attempt to direct users to external, potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://trafftec.ru/123?utm_term=animated+stories+from+the+new+testament+the+miracles+of+jesus PDF link annotation
    • https://cdn.sqhk.co/kagurase/NTjbUja/97744077815.pdfIn PDF document text
    • https://fugopezawisobib.weebly.com/uploads/1/3/1/3/131383650/5394445.pdfIn PDF document text
    • https://cdn.sqhk.co/pevelefotuve/tthfzoV/purenew.pdfIn PDF document text
    • https://cdn.sqhk.co/penunotati/foiaJge/bosorasuliguzebuv.pdfIn PDF document text
    • https://tojaluteder.weebly.com/uploads/1/3/4/3/134384479/nafugavezun_naxaditumikal_joputokorupe.pdfIn PDF document text
    • https://cdn.sqhk.co/tupipitijil/ihaQKjb/quran_teacher_online_dawateislami.pdfIn PDF document text
    • https://wobikuneli.weebly.com/uploads/1/3/2/7/132741052/sipij.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/af608505-8fa9-43c8-abc3-d8f4890de5f9/69697109355.pdfIn PDF document text
    • https://s3.amazonaws.com/jivuxo/2016_cummins_isx_repair_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/zufaxepixiguxax/toketav.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_off0000e1e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1E6 5416 bytes
SHA-256: ffe4c70f2b21be0cc2437f641852d2cf69c79a7536eb8b323d7614ba03383031
font_01_sfnt_off0000f440.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF440 11020 bytes
SHA-256: 2980eda9af3c5fcf67d18de8db00d11901db334ab489c2dbb110019fe1e00890