Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f85b664dde13dda…

MALICIOUS

PDF

66.2 KB Created: 2021-03-17 11:38:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 5175aa02fa44dcaad562b496a37e01c3 SHA-1: d85b568ce80740e27bb9b74469a51b8d55af7725 SHA-256: 8f85b664dde13ddaba69563ba32f91494dfbf17b2f5f24259b635c9753d01790
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-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://golowaki.ru/wix?keyword=metric+conversion+worksheet+1+answer+key PDF link annotation
    • https://cdn.sqhk.co/xotabuti/jjYLCN7/73522205540.pdfIn PDF document text
    • https://vawilateg.weebly.com/uploads/1/3/4/6/134697686/vejuxuf-fuguzarudujegi-gebipixodo.pdfIn PDF document text
    • https://cdn.sqhk.co/pomoliwekag/cLhgiaS/cambridge_english_proficiency_test_sample.pdfIn PDF document text
    • https://noxaxubobef.weebly.com/uploads/1/3/1/3/131380993/pekafunebakevonule.pdfIn PDF document text
    • https://cdn.sqhk.co/dexujagafir/jiuIjb1/nekov.pdfIn PDF document text
    • https://cdn.sqhk.co/bafebolabefo/hdqHhgU/pba_tour_bowling_2019_earnings.pdfIn PDF document text
    • https://togezajotutev.weebly.com/uploads/1/3/0/8/130874352/9440948.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://ribaxekag.epizy.com/armor_all_original_protectant_sds_sheet.pdfIn PDF document text
    • http://diwulabasiluxe.epizy.com/indian_instant_pot_cookbook_recipes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/570c4c82-861c-4232-9c53-ca08e5ac1664/multiplying_exponents_fractions_calculator.pdfIn PDF document text
    • http://majerowi.epizy.com/96390626850.pdfIn PDF document text
    • http://vomifavub.epizy.com/formation_windev_mobile.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/894763b7-f8df-44d8-9fa7-0429043d3586/what_is_media_exposure_means.pdfIn PDF document text
    • https://s3.amazonaws.com/genedesowul/gekum.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8708f549-c423-4186-800d-3e9fe8510e6f/jesus_storybook_bible_advent_2018.pdfIn PDF document text
    • http://tukudapig.epizy.com/momibusuvuduwilakuwutub.pdfIn PDF document text
    • https://s3.amazonaws.com/vebisop/slope_intercept_form_worksheet_with_answer_key.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/edd75403-1f15-4230-819c-a8e9ec07b3cf/rekefejisukogexe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fd145e32-cbe3-4980-9f08-234fd9051a10/janilevagoxotixo.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_off0000c59d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC59D 5232 bytes
SHA-256: 40720ea28383b5be14d8e97c3eba32e8f871e6e23c054668d3b513d8fcd0f877
font_01_sfnt_off0000d790.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD790 10464 bytes
SHA-256: 70bb5b9d779255a09f6450182961aafe5d5add2490b9702de128731f5c2689aa

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