Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4a0f58b3d768707…

MALICIOUS

PDF

71.4 KB Created: 2020-12-01 05:48:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-24
MD5: a59c2cc0d0460fd9505f50cc491d0320 SHA-1: b80b838b83e6d280be9ade2875d2747c9b2fb136 SHA-256: b4a0f58b3d7687074eabe646cc5efc936ddca213d5d9e30c209c465dda8e885d
214 Risk Score

Malware Insights

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

This PDF file contains a large number of embedded links, with at least one pointing to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to lure users to malicious sites.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://cctraff.ru/123?utm_term=whiskey+a+go+go+website In PDF document text
    • https://cdn-cms.f-static.net/uploads/4426416/normal_5fb704db9050d.pdfIn PDF document text
    • https://gozanesudobewer.weebly.com/uploads/1/3/4/8/134852120/bedezasopalapofidowo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384296/normal_5fb369002676c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381320/normal_5fa1cf9fbea58.pdfIn PDF document text
    • https://xisipoven.weebly.com/uploads/1/3/4/2/134266343/4531397.pdfIn PDF document text
    • https://vobijiwemifi.weebly.com/uploads/1/3/4/6/134673224/6864cc5a1144.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374689/normal_5fc48b5ceacf2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375514/normal_5f8d89b006954.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450046/normal_5fbe395f554a0.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://uploads.strikinglycdn.com/files/5b97adcc-829d-48c5-99ad-3ee0789d8b24/57528090402.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbdf0b461e25426e1fdfe92/1606283446913/pinegege.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7aa6bb21-5aff-4919-9df6-6a6c3f26b017/45378671486.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1691bafa-f1ec-4565-bf09-f7c875df5da3/linuxuw.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0fe386b97992eb55c938e/t/5fc12c06173fb5383bcc80c2/1606495238696/inc._and_grow_rich_portugus.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_off0000ce0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE0D 4912 bytes
SHA-256: 069b93ddd40e7c3f5e13091268335e28ac48022de662e8602b678d7ae9fd961c
font_01_sfnt_off0000deed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEED 10624 bytes
SHA-256: a360c49550845107b39a9745a697dd679c2cae34c85bb4784f5ca73d2ad4d582
font_02_sfnt_off000102c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102C7 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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