Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0b025d487f2f11c…

MALICIOUS

PDF

71.2 KB Created: 2021-01-08 06:12:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 5f31c733747ef00d75fe9756b31561be SHA-1: 0f7477e0a5d4e789e81e42f431e616f635ebe0be SHA-256: d0b025d487f2f11c2f674e8e4146893bb873494e6db79d73223adc82ea16bd62
244 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to disposable hosting or redirector services, indicating a link farm designed to distribute malicious content. The presence of a critical PDF_MALICIOUS_REDIRECTOR_LINK heuristic firing further supports this, as does the ML classifier's high confidence score. No scripts were extracted, but the structure suggests a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://traffmen.ru/123?utm_term=combination+circuits+practice+worksheets In PDF document text
    • https://rosofofupamufi.weebly.com/uploads/1/3/4/3/134364257/83edc5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369922/normal_5ff1af73bc640.pdfIn PDF document text
    • https://fadefewili.weebly.com/uploads/1/3/4/3/134316521/04e09e22ea4e22.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495262/normal_5fad3b6fb233d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366405/normal_5fadc2547f148.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381978/normal_5fd8bb5d648cb.pdfIn PDF document text
    • https://cdn.sqhk.co/vexapalas/rFiiifm/92688968894.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484612/normal_5fd30e5833c2a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408348/normal_5fd8d7b545414.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401976/normal_5fdc24ea0473c.pdfIn PDF document text
    • https://gumelajijepepa.weebly.com/uploads/1/3/4/6/134639918/mewup.pdfIn PDF document text
    • https://jexenixikejov.weebly.com/uploads/1/3/4/6/134632916/givowipituwerap-mubupipi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455884/normal_5fa02944d2640.pdfIn PDF document text
    • https://tekegalesi.weebly.com/uploads/1/3/0/7/130740489/ad2ba0f91.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367921/normal_5f8a9b9995724.pdfIn PDF document text
    • https://fevixivosetakub.weebly.com/uploads/1/3/2/6/132681861/bizepig_sifalexupaxo.pdfIn PDF document text
    • http://fontawesome.iohttp://fontawesome.io/license/In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000ce12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE12 2820 bytes
SHA-256: e69e20141c1c2cd20fe1a72a08bfd6ea46172f2d8ed34331ff988bb3647ed1c7
font_01_sfnt_off0000da57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA57 5340 bytes
SHA-256: e679e7e68656dbb43b469be8d7ece1b4662fe25db040cfc9a6fb7b92107146f1
font_02_sfnt_off0000ec5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC5F 10184 bytes
SHA-256: 6a6bedaec442d37ed6f101e8fd00a56fa69afbe4723c5a60aa32e68447e2527f

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