Malicious PDF — malware analysis report

Static analysis result for SHA-256 d78dd3b2b82dcb52…

MALICIOUS

PDF

63.6 KB Created: 2020-12-14 21:53:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 2ab84be42c2791d40a6fb41b5b64e287 SHA-1: d6b929b5ac913f1b9fdb2c4ee044eead8cb32d84 SHA-256: d78dd3b2b82dcb526f0088960e5fe432e4e0abdd79a6752fef5ac72ced0f97bb
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are to PDF files, suggesting a link farm or SEO poisoning attempt. One of the extracted URLs, https://traffset.ru/123?utm_term=is+stamps.com+down, is flagged as suspicious and likely leads to a malicious site. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution.

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://traffset.ru/123?utm_term=is+stamps.com+down PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4416490/normal_5fce6c44f0501.pdfIn PDF document text
    • https://newejata.weebly.com/uploads/1/3/3/9/133999860/6371299.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371787/normal_5fd2e49e97848.pdfIn PDF document text
    • https://nunigagajil.weebly.com/uploads/1/3/4/7/134751499/bupiborufosus.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449392/normal_5fa0f6efdebd3.pdfIn PDF document text
    • https://refapezi.weebly.com/uploads/1/3/4/9/134904673/suguziwatajoge.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/gurupixabogivaz/css_form_design_templates_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d7afd735-961c-4235-9d7e-77a45ccd18f8/romeo_and_juliet_timeline_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/widiku/gatakukegelijikovap.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/288f4825-210d-4357-99fc-71191fb3cdcd/kpn_ka_yz_var.pdfIn PDF document text
    • https://s3.amazonaws.com/gofilafixu/fidawulijupewisijaz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/afdb048c-5342-47d1-b10e-1e1cb49904d5/7885710182.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/70a5da89-0c20-4862-acdb-3ce98ec25ac4/61119825053.pdfIn PDF document text
    • https://s3.amazonaws.com/henghuili-files2/9938470704.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b2af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2AF 4776 bytes
SHA-256: da09fd1c4a951337240caf31f795170dc44f62fe3c0794a659d258e9e12ff7f7
font_01_sfnt_off0000c2cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2CF 9588 bytes
SHA-256: 5c39de713b503e019928343a0f7695ae77379409ee73bfabdf373ab13cdf0d2e
font_02_sfnt_off0000e3b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3B0 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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