Malicious PDF — malware analysis report

Static analysis result for SHA-256 17fbafd663566eb2…

MALICIOUS

PDF

72.2 KB Created: 2021-06-07 08:15:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 780387cfd8a73d9a9ab55490d34b1417 SHA-1: 982ee98130ac0ea7338a4b97f047d1e63e90c04f SHA-256: 17fbafd663566eb24536d39c10a97837a1749f8c0cef6cd6a927b0bc1c8c0dc8
186 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. 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 0.9998

Heuristics 6

  • 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.
  • 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://krisoc.ru/pbw?utm_term=first+trainer+2+pdf+vk PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4412780/normal_600fc8b2547a9.pdfIn PDF document text
    • https://gelatotagubas.weebly.com/uploads/1/3/0/8/130813077/dinije.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427080/normal_600a48cf1eb33.pdfIn PDF document text
    • https://tasunukalen.weebly.com/uploads/1/3/4/8/134888382/523e7.pdfIn PDF document text
    • https://dupafubakatato.weebly.com/uploads/1/3/5/9/135961249/1894364.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4463559/normal_60b2e78a853b8.pdfIn PDF document text
    • https://zijovegumasapal.weebly.com/uploads/1/3/4/3/134307166/aa82a0b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410016/normal_6011a7453d74d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417525/normal_5ff357079d2f6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420760/normal_603ffcbae6980.pdfIn PDF document text
    • https://jowiginuzag.weebly.com/uploads/1/3/1/4/131438641/ebd6a0d3c7a9.pdfIn PDF document text
    • https://tuvaruwa.weebly.com/uploads/1/3/4/7/134711775/8896663.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rumusapage.pbworks.com/f/sujajokali.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cc504b3d-48dc-459e-91bc-5e09b00b177d/the_power_of_positive_thinking_book_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/23fc4a20-b3de-41c0-8122-e5749d38159f/what_to_do_if_your_dishwasher_isnt_cleaning_properly.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/592aca1e-e728-4b58-92c4-2350532c738a/wefawajukidileg.pdfIn PDF document text
    • http://vogituvu.pbworks.com/w/file/fetch/144495615/37547392658.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_off0000d245.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD245 5212 bytes
SHA-256: 2e840cb86fc667e6e7f7bc51848843af119cd0c70046ca07d4d6a7bf2662b8b1
font_01_sfnt_off0000e424.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE424 14800 bytes
SHA-256: 09203150796c32d1816dcc40a6d7e4a0c6cb2ad0cc9c462ab03d3860d27c58a0

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