Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd50f00b843b7115…

MALICIOUS

PDF

77.1 KB Created: 2020-12-03 22:22:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 1f605c9daf4a183c945916b06ef86dd7 SHA-1: db12a14fc967d9a596d1ef85afe3ff794fe9ef00 SHA-256: dd50f00b843b7115bc35bafd2fd2b6bee89975fee96e4af9ab52deeef8648214
164 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses an urgency-based lure. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://traffine.ru/123?utm_term=what+is+ootdfash PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4478134/normal_5fb2dfa3146c8.pdfIn PDF document text
    • https://fabidarupevonu.weebly.com/uploads/1/3/4/6/134620419/9369776.pdfIn PDF document text
    • https://luwobidope.weebly.com/uploads/1/3/0/8/130814225/kisusovimogax-xagonujobed-wejakimemubumix-povojavibik.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379233/normal_5f8ae70f2cbe5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408195/normal_5f969325a1d07.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367294/normal_5f88340631330.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409998/normal_5fb5de128f8f1.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/c8c1f18e-9820-423a-a3b8-c82e574e2cdf/46873721477.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/84d7cca3-f32b-4e19-b58c-72bb914a8fb2/kinivo_btc450_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2eb5e016-8d86-4fa6-b0c8-4eb9adbb1e69/7110404770.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc36737bdb33045eed226b2/t/5fc415d41972c46e3c1d834e/1606686164749/vertical_structure_of_the_atmosphere_answer_key.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dc0d6d9d-1ccf-47c3-988d-6c4fe6c31cc0/28328127691.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6bdcc440-58ee-4c63-8a85-8a687f333195/42965007807.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc789945426f52a30df8d2d/t/5fc886c846ef2e08cbb85d75/1606977224631/73170527280.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_off0000e380.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE380 4444 bytes
SHA-256: 44b563a402c488874f24c0de5fb5d2985719c8e58f63b2cff9644ad4df8250c0
font_01_sfnt_off0000f2a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2A8 11520 bytes
SHA-256: bf75a3f817d92a96f244b65a5c5c41702dd7341c6d4e7735727c4e373ce5f54a
font_02_sfnt_off00011963.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11963 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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