Malicious PDF — malware analysis report

Static analysis result for SHA-256 622547446c668a4c…

MALICIOUS

PDF

81.4 KB Created: 2021-02-13 22:59:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: cfd0e1cdcac4b377f8d844f5bc1ecd6a SHA-1: bded9c33197592f3637ec9f05db09361d5907212 SHA-256: 622547446c668a4c4854e82ceaf4aba70075246be98bd60a5ab596bce8bfc85b
126 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 embedded URLs, many pointing to disposable domains and link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://leonvi.ru/aws?utm_term=arranging+numbers+from+greatest+to+least+worksheets PDF link annotation
    • http://lefavapexusa.iblogger.org/smart_internet_of_things_projects.pdfIn PDF document text
    • http://erogancolumbia.site/the_kula_ring_is_an_example_of0hz9q.pdfIn PDF document text
    • https://gawakugoful.weebly.com/uploads/1/3/4/7/134757428/zulezosujedeja-konega-xajowufamixap.pdfIn PDF document text
    • https://texoxarisozitew.weebly.com/uploads/1/3/0/9/130969357/963fcf1d12e3fbc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421341/normal_5fc63b51b84c6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482399/normal_5fcd75cbdac38.pdfIn PDF document text
    • https://cdn.sqhk.co/dasisogi/Wghb0hd/tuberculosis_deaths_2019_vs_covid.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460690/normal_5ff4f0ebf19a1.pdfIn PDF document text
    • https://fitokuzigijot.weebly.com/uploads/1/3/4/6/134681543/sulediruxono.pdfIn PDF document text
    • http://tawojerikopopud.iblogger.org/apple_10k_annual_report_2013.pdfIn PDF document text
    • https://dijitisabotiji.weebly.com/uploads/1/3/5/3/135324222/bufegifixenuzo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://fobupozomorefiw.epizy.com/gegikemiravapubodu.pdfIn PDF document text
    • http://xonezerimagu.rf.gd/5183969224.pdfIn PDF document text
    • http://tonixororonimi.rf.gd/simupipavon.pdfIn PDF document text
    • http://zonatenitisa.rf.gd/xexixagovifa.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f14e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF14E 5348 bytes
SHA-256: aec3fde67f385932114b6db034f217b0cdb496da4a670ea3bbe5f40c53a696b2
font_01_sfnt_off0001035e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1035E 11372 bytes
SHA-256: 75ee33b74de13392b18e683637009f871f06533a1e7f82893f99a3db3dff00a3
font_02_sfnt_off000129f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129F6 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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