Malicious PDF — malware analysis report

Static analysis result for SHA-256 5567f5976078e757…

MALICIOUS

PDF

71.7 KB Created: 2020-12-18 14:44:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: e298a6e70136302f4d55d6c43d9ec6c6 SHA-1: 4565365024026a2bcf62556f1ea6110a923b54c8 SHA-256: 5567f5976078e7572554f6987ff742aea1e9e9266276079b900e56f2bcef16ef
206 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or SEO poisoning tactic to drive traffic to potentially malicious sites. The presence of a callback lure heuristic further supports a phishing or scam-related attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://traffking.ru/123?utm_term=introduction+to+computer+security+goodrich+pdf+download PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4402707/normal_5fcea6f87712c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383692/normal_5fbc2c244b45c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468536/normal_5fa5c780adf30.pdfIn PDF document text
    • https://fiwixenolo.weebly.com/uploads/1/3/4/4/134493020/9fa48bf6992.pdfIn PDF document text
    • https://nofizosol.weebly.com/uploads/1/3/4/5/134500220/kufod.pdfIn PDF document text
    • https://niramividaro.weebly.com/uploads/1/3/4/5/134517418/ccc3a42d8b8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481173/normal_5fd8142bc780f.pdfIn PDF document text
    • https://sefedajexoxoj.weebly.com/uploads/1/3/4/4/134479396/d6f9c58876d2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/6d448198-64ca-4dcb-af66-cb987d688a62/nejipu.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc518012e537a05ef24173b/t/5fcdef5f3ff10115401542f2/1607331680019/lidamabeko.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/df15b0a2-2cbb-4d63-ab4c-30ff9ab333e3/medical_terminology_book_2019.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a2cef4d4-698a-4f7b-af3b-a4a68198569f/39939794374.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/881f2f1d-2121-4c6d-9870-8f9eabcb4864/nawudosutavewoj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4d19d964-b2ff-4511-8a40-19aba8c7aa37/1st_grade_level_reading_comprehension_worksheets.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5b9ba9b3-2123-4b30-9a47-5ace359fa39b/mexixotube.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_off0000d764.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD764 5700 bytes
SHA-256: cbc432cf0ae107374d823bac5f89c7d20420a296fd0817c677ee5d221513d914
font_01_sfnt_off0000eab7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAB7 11424 bytes
SHA-256: c1c19ab6c2b99f2299c641a83c05dcaf9e8ab50f744a782577f46c17860873ec

Open this report in the interactive analyzer, or submit your own file for analysis.