Malicious PDF — malware analysis report

Static analysis result for SHA-256 efbcb0f20ae545e7…

MALICIOUS

PDF

69.6 KB Created: 2020-11-14 19:36:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 9510d60f4f0102c361493c0162653394 SHA-1: 8b370dcb029df1bc060db49468081e4e57cdc0ff SHA-256: efbcb0f20ae545e72143740b3452bfa816d2921097d9d78aca1bed10f0b2db75
156 Risk Score

Malware Insights

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

The PDF contains a mass of external links, many pointing to potentially malicious domains, and is flagged by ClamAV as a phishing trojan. The document body, though heavily obfuscated, suggests a lure related to a 'teacher contract'. The presence of embedded URIs and a link farm indicates an attempt to direct users to external malicious content, likely for phishing or malware delivery.

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://traffnew.ru/123?utm_term=bloom+township+high+school+teacher+contract PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4384460/normal_5fa118b79048a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403557/normal_5fa4eab33e910.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368752/normal_5f9794c3e2101.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365607/normal_5f871ba3e3e93.pdfIn PDF document text
    • https://voziguwotameba.weebly.com/uploads/1/3/4/3/134345279/ffc40040a9e2.pdfIn PDF document text
    • https://basurujilitafap.weebly.com/uploads/1/3/4/5/134595952/f926f2ca22d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415309/normal_5f99262287825.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379852/normal_5fa5c8b7cf16e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477863/normal_5faf408d49caf.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/tawosutosuxi/olaudah_equiano_biography.pdfIn PDF document text
    • https://s3.amazonaws.com/xubifupi/insane_math_games_run_2.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3ba145c9-444f-4393-8573-a64b1b5eaa02/dokupi.pdfIn PDF document text
    • https://s3.amazonaws.com/gupuso/pdf_file_format_not_supported.pdfIn PDF document text
    • https://s3.amazonaws.com/xedewofuretujo/lds_housing_nyc.pdfIn PDF document text
    • https://s3.amazonaws.com/pewebopufupe/wipro_aptitude_questions_and_answers_with_explanation.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_off0000d1b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1B9 5488 bytes
SHA-256: a37e87329eb7bea009782e9b21bbac142effb20d2956487e33548055b8fd7405
font_01_sfnt_off0000e456.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE456 10972 bytes
SHA-256: e88aed2c15ff95c5544c8c644178332b19b97b81e4bb26608744d58c7c10b88c

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