Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4fb96b3939805bc…

MALICIOUS

PDF

81.1 KB Created: 2021-04-24 23:26:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: fd58d1f8744d694b6a484eabdca2ab29 SHA-1: df73cbe0f5d4256722ace5f59a11a1c6befafac0 SHA-256: c4fb96b3939805bc153776ee2a6242f0807a16408fb1eb0e0fdf5de2251c4c4e
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9993

Heuristics 5

  • 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 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://soxebez.ru/strik?utm_term=beginning+and+intermediate+algebra+6th+edition+free+download PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4489057/normal_5ffe278741756.pdfIn PDF document text
    • http://normaa-id.com/art_puzzle_live_jigsaw_coloring_page6u6a5.pdfIn PDF document text
    • http://italiahot.space/39692480843rm0bs.pdfIn PDF document text
    • http://toredakaf.22web.org/jisetusepatefobutiladu.pdfIn PDF document text
    • http://rasprodavaika.ru/fevojevufarulileq9dd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490720/normal_602b9b33260d3.pdfIn PDF document text
    • http://accueilcmb.com/79509834301dd1ur.pdfIn PDF document text
    • http://copyrightreports.com/my_movie_windows_live_movie_maker_tutorialnxm53.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495854/normal_604503b72bbbb.pdfIn PDF document text
    • http://zufufamaz.66ghz.com/98553204563.pdfIn PDF document text
    • https://kuwumezebuxe.weebly.com/uploads/1/3/4/1/134131528/a1787ec.pdfIn PDF document text
    • https://guvolobojifo.weebly.com/uploads/1/3/4/7/134733869/kutotir.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://tonerud.epizy.com/principles_of_geomorphology_book.pdfIn PDF document text
    • http://lizesurova.rf.gd/mitizobavefenarokufozaba.pdfIn PDF document text
    • http://tibojerevaf.rf.gd/30923137553.pdfIn PDF document text
    • http://pubupetedibu.rf.gd/apc_smart_ups_rt_2200_manual.pdfIn PDF document text
    • http://wurunepoxu.rf.gd/luzoviduwunexuvik.pdfIn PDF document text
    • http://kinapemib.rf.gd/geometric_sans_serif_fonts.pdfIn PDF document text
    • http://nigabosepa.epizy.com/57748188096.pdfIn PDF document text
    • http://zasuzutan.rf.gd/fotutakotapaluzu.pdfIn PDF document text
    • http://nolepukopele.epizy.com/mastering_biology_chapter_13_reading_guide_answers.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dada.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDADA 5364 bytes
SHA-256: 14dac0e9148da457f8d8fbdfa4a2264b1bd4a65185bbf88529a170d035003822
font_01_sfnt_off0000ecf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECF9 11044 bytes
SHA-256: 460c3044f0564bef76dcb51315b685922186d8a5f6c4594401fb4fd823aa9335
font_02_sfnt_off000112c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112C3 16204 bytes
SHA-256: a95eff378c135b1ab40d10b3cd1da1bafbc07f86005f57898d079c90d712ddbd
font_03_sfnt_off000127f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127F0 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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