Malicious PDF — malware analysis report

Static analysis result for SHA-256 0cb10f3df4de85a5…

MALICIOUS

PDF

66.3 KB Created: 2020-12-15 04:54:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: c52c510d5f26f081caf425c04f349362 SHA-1: d37b6f43cd56bd05c8b52561a36c39d4f1b3a915 SHA-256: 0cb10f3df4de85a5839edef0c0b460e0fa3a99c4671104c27aa698a821ff4c86
244 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF document is identified as malicious by multiple heuristics and a machine learning classifier, including critical alerts for malicious redirector links and a link farm. The document contains numerous embedded URLs, many hosted on disposable domains, which are likely intended to redirect users to phishing or malware distribution sites. The presence of a link farm and a redirector URL strongly suggests a phishing or scam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://ggtraff.ru/123?utm_term=personal+finance+for+dummies+8th+edition+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4419433/normal_5f9e7c18a65af.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414159/normal_5fd7ec3519582.pdfIn PDF document text
    • https://pimupaxepa.weebly.com/uploads/1/3/1/8/131857198/6e0d65838d805.pdfIn PDF document text
    • https://gigunomivu.weebly.com/uploads/1/3/0/9/130970016/begadobozelove-sunaxivobonox.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387699/normal_5f90eb289dc4f.pdfIn PDF document text
    • https://biparobotimipus.weebly.com/uploads/1/3/4/4/134498468/3922a80a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479906/normal_5fd2c61e8ea15.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411717/normal_5f98e0cf3c208.pdfIn PDF document text
    • https://zuwadakake.weebly.com/uploads/1/3/4/6/134664894/siwabut.pdfIn PDF document text
    • https://zatazonikafude.weebly.com/uploads/1/3/4/3/134340422/lemizaxalaku-zutod-xavim.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450156/normal_5fada32eb42bd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369638/normal_5fab231106459.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/fukepez/xowibariwedefogobejezizo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4c3a61bd-d17e-45e9-a8ad-d922c8b661f7/jipivofolid.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_off0000c602.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC602 5588 bytes
SHA-256: 73779795f3cb030e2cedaef9d8c2a60efe13745da11e68c0ab1344e97e74b074
font_01_sfnt_off0000d8da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8DA 10368 bytes
SHA-256: 7d7a393cfde793ee4e090a5c5841cfbb01735bdc9e42e95e25bd99c5ad343bf2

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