Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d65afa08e90209c…

MALICIOUS

PDF

96.5 KB Created: 2020-11-06 09:30:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 34be6318b90f683672061691769f7502 SHA-1: 9b80f327130c09dd60c459b64c928020a4e93948 SHA-256: 2d65afa08e90209c913d2611997dc99ad49d68e67cecf8b403d0c99496de8c3e
116 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, many pointing to PDF files hosted on various platforms, suggesting a link farm or SEO poisoning attempt. The heuristic 'SE_CALLBACK_LURE' indicates the document is designed to trick users into calling a phone number, likely for a scam. While no scripts were extracted, the presence of numerous external links and the callback lure strongly suggest a phishing or social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • 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://traffset.ru/strik?keyword=axial+resolution+oct PDF link annotation
    • https://vezexozozufizus.weebly.com/uploads/1/3/4/3/134372857/7379122.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386607/normal_5f9c1b98ee00f.pdfIn PDF document text
    • https://sasakafu.weebly.com/uploads/1/3/4/3/134371045/wipudisif-jirode-vukidad-sigopu.pdfIn PDF document text
    • https://bozofuki.weebly.com/uploads/1/3/4/3/134322044/050ab486e16.pdfIn PDF document text
    • https://buliduxefexefux.weebly.com/uploads/1/3/1/6/131636978/d9329f.pdfIn PDF document text
    • https://fupojipivub.weebly.com/uploads/1/3/4/5/134525069/ff6dc7b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391315/normal_5fa0aff9b6b92.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/tuzamada/articles_of_partnership_examples.pdfIn PDF document text
    • https://s3.amazonaws.com/zidosozawok/area_of_composite_figures_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/fomaralunex/apush_crash_course_4th_edition.pdfIn PDF document text
    • https://s3.amazonaws.com/bevekizadoxuj/71543445002.pdfIn PDF document text
    • https://s3.amazonaws.com/duzexefemosaxe/couper_image_en_deux.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a092cc3d-f808-49a3-ba7d-697950c7b50e/senevuwadojubikig.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000123db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123DB 4852 bytes
SHA-256: 5713377209198ab0f35be8db76226a8a5d86c882804a3eb4d8510a65a5db5dc3
font_01_sfnt_off0001346a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1346A 13368 bytes
SHA-256: 6d05944a7d61960539590c2feb0a1eb1f3d85aaadd5375f138a339d7e90128d0
font_02_sfnt_off00015fab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15FAB 16036 bytes
SHA-256: 35d3440dae1ebc896564e4e6f70ea95aa3a30a1ac603c7fffbb21b68b8b72e2f

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