Malicious PDF — malware analysis report

Static analysis result for SHA-256 6163040a508d0324…

MALICIOUS

PDF

76.6 KB Created: 2021-02-25 06:00:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 51fa9f14a49b192363fefe96e5ab266f SHA-1: f789a8219039967a8b628be6d497e24472c51897 SHA-256: 6163040a508d03242d07a740a96a69b5e001d309f965a8f689996f76b2abb1de
156 Risk Score

Malware Insights

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

The PDF file exhibits characteristics of a phishing or SEO spam campaign, indicated by the presence of a large number of external links, many of which point to other PDF files. The document body, though heavily obfuscated, contains text related to 'Harry Potter' and the wkhtmltopdf tool, suggesting a lure. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to distributing further malicious content or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://maypoin.ru/123?utm_term=harry+potter+and+the+half+blood+prince+audiobook+chapter+14 PDF link annotation
    • http://pobijubak.iblogger.org/kavefaxunetuvumofi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393488/normal_6025df096fc04.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446152/normal_601febe19f2a3.pdfIn PDF document text
    • https://nusutaligufobam.weebly.com/uploads/1/3/5/3/135393176/vogoxutof-detox.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411501/normal_5fd78cc684505.pdfIn PDF document text
    • https://remejatezikame.weebly.com/uploads/1/3/1/0/131070309/xeredase.pdfIn PDF document text
    • http://xirurup.iblogger.org/scientific_method_lesson_plan_middle_school.pdfIn PDF document text
    • http://zikapipumimapo.22web.org/honda_3200_psi_pressure_washer_manual.pdfIn PDF document text
    • https://wuwiragirek.weebly.com/uploads/1/3/0/8/130874366/e44cd.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/vovuzize/75412882275.pdfIn PDF document text
    • https://s3.amazonaws.com/jizubisetebof/laxudedujivagek.pdfIn PDF document text
    • http://wavujeg.epizy.com/paruvininipunapuzevasobid.pdfIn PDF document text
    • https://s3.amazonaws.com/zevutebulaworel/58004866198.pdfIn PDF document text
    • https://s3.amazonaws.com/jinabom/94348636070.pdfIn PDF document text
    • https://s3.amazonaws.com/boxujetanonikuv/fisher_price_toy_for_toddlers_crossword.pdfIn PDF document text
    • https://s3.amazonaws.com/pexodugosa/calendar_2019_free_template.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_off0000ed7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED7D 5472 bytes
SHA-256: 24d346b3f052dd8fa37480aeb3ec680982497d5df76bba652574d8f0484e6bb7
font_01_sfnt_off00010021.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10021 10800 bytes
SHA-256: 296e49a50f815167352493b00c2f883e4d3b548c8e1f764142cdc8309ab87497

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