Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2963b3aebaa5fcd…

MALICIOUS

PDF

74.1 KB Created: 2021-03-20 06:00:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 6d297e41a8f52a250601e56ea2c50b78 SHA-1: b6fd37a54518ac0a60a1d7dcf1e24c6322efa69f SHA-256: f2963b3aebaa5fcd871cb563cfbfcf0b41439093a20fa0c41663093f50b68e2d
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a large number of external links, suggesting it is part of a link farm designed to manipulate search engine results or direct users to malicious sites. The primary URL identified is https://jacksth.ru/wix?keyword=federalist+vs+democratic+republican+chart, which appears to be a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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.
  • 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://jacksth.ru/wix?keyword=federalist+vs+democratic+republican+chart PDF link annotation
    • https://suruwizad.weebly.com/uploads/1/3/4/7/134766156/fc57e.pdfIn PDF document text
    • http://gufurebu.medianewsonline.com/guvap.pdfIn PDF document text
    • https://sikezenubotimer.weebly.com/uploads/1/3/0/7/130739875/5035305.pdfIn PDF document text
    • http://yachts-4-sale.com/altered_carbon_season_2_returning_characterszwrnv.pdfIn PDF document text
    • http://duwosolutanuz.mypressonline.com/21965651779.pdfIn PDF document text
    • http://claire-irk.ru/advanced_trauma_life_support_online0shqr.pdfIn PDF document text
    • http://kotudekudoges.getenjoyment.net/kejuru.pdfIn PDF document text
    • http://1ux.site/zolatiwg6cn.pdfIn PDF document text
    • https://mafatuxaxi.weebly.com/uploads/1/3/1/3/131384293/2244098.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/532de545-28d9-4e47-9933-0a1349d8d1df/72989114619.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7b6f5931-d555-43e4-8f35-c608a48d22c6/pilesetob.pdfIn PDF document text
    • https://s3.amazonaws.com/potamotaz/mugexa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/53b935b0-0df6-4846-996e-27efc2ea2802/significant_difference_between_viral_pneumonia_and_bacterial_pneumonia.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4eb81908-0cfa-4893-87ba-45a7d32c1beb/matlab_function_return.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/390caef0-fad8-4bae-9671-7c14dd9db2cc/tatagilamokavarolutiwe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ddc56904-6d24-4709-83b8-60cf9ca13880/is_super_mario_sunshine_on_wii_u.pdfIn PDF document text
    • https://s3.amazonaws.com/bokofapig/fadurigakedixakemom.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_off0000e3ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3EE 5468 bytes
SHA-256: 8a20b3c00a8e0713f9ccb893c33c7a6c31999f722b87b8dd12ee2eb1d42f496d
font_01_sfnt_off0000f65a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF65A 10984 bytes
SHA-256: b1ad84bb13adc89b9e24476a46aece6b0428ce1fe38200841519eaac072ea51a

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