Malicious PDF — malware analysis report

Static analysis result for SHA-256 4551280a7c526568…

MALICIOUS

PDF

75.5 KB Created: 2021-03-31 10:14:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d3acb079e7364b62f99f2d746621148e SHA-1: 59815124092f19ed2a1d2e20dcc8053254213daf SHA-256: 4551280a7c526568f5e3e17578133ca204879631f6df52de3bd42e3db044f04c
164 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to PDFs hosted on Weebly and other community sites, indicative of a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were directly extracted, the PDF structure and numerous external links suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/123?utm_term=brandon+grotesque+google+font+free
    • https://talidifixuj.weebly.com/uploads/1/3/5/3/135390844/5b09f7beca6cea.pdf
    • http://boforobevuziko.mywebcommunity.org/14324869173.pdf
    • http://vodabutopidaru.getenjoyment.net/the_chronicles_of_narnia_the_magicians_nephew_reading_level.pdf
    • https://timokejega.weebly.com/uploads/1/3/4/4/134454798/7717080.pdf
    • http://okclub.org/homemade_gun_workbenchiv914.pdf
    • https://zomuguzilax.weebly.com/uploads/1/3/5/3/135327960/wuvafejamewuzul_xevebek.pdf
    • http://sallles.ru/uad_apollo_twin_usb_price_in_indiacsjtf.pdf
    • http://kinoxca.xyz/how_to_heal_your_body_naturallyg67qr.pdf
    • http://good-production16.site/37864877442kxwgy.pdf
    • https://vuwuzujos.weebly.com/uploads/1/3/2/7/132712237/03d7d3db.pdf
    • https://sezosuxinowa.weebly.com/uploads/1/3/4/2/134266263/daxotemabi.pdf
    • http://ru-payment.casa/thirteen_reasons_why_book_vs_serieswwnfm.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/libeganot/dissecting_microscope_parts_and_functions.pdf
    • https://s3.amazonaws.com/nagudo/define_colony_forming_unit_in_microbiology.pdf
    • https://s3.amazonaws.com/vokeri/hipaa_guidelines.pdf
    • https://s3.amazonaws.com/muvarelo/classification_of_financial_markets.pdf
    • https://s3.amazonaws.com/tapexiw/ccleaner_pro_crack_2019.pdf
    • https://s3.amazonaws.com/fofeguj/37461740173.pdf
    • https://s3.amazonaws.com/kijelopazekune/91374504248.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e9a7.bin
ad4e9b8c2d3e2c024e187e0d982f7dcf57ae4dbada731c2ad01b0140455bbbc7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE9A7 5252 bytes
font_01_sfnt_off0000fb8a.bin
4a4bdb464f1358080e9313951aa9515e53e9dd6fec90e8320ea27973274ce695		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB8A 10644 bytes

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