Malicious PDF — malware analysis report

Static analysis result for SHA-256 c95d559b985fc3a3…

MALICIOUS

PDF

72.5 KB Created: 2021-09-12 02:47:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 56dc0019d8ff05fba67071dae23157b7 SHA-1: 5dff3ee91f274a91dea17d7e9c952473219c8252 SHA-256: c95d559b985fc3a39fa9661fff21405701c9023ab6237df5385660a943b745dc
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with many pointing to potentially disposable hosting, suggesting a link farm or phishing lure. While no scripts were explicitly extracted, the presence of embedded URLs and the PDF structure itself are indicative of an attempt to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://yunnanyingxiang.com/ckfinder/userfiles/files/kodaxovibog.pdf In PDF document text
    • http://ugrctrani.it/userfiles/files/mimuposi.pdfIn PDF document text
    • http://webbuilders.com/files/file/83388653250.pdfIn PDF document text
    • http://homeopathyhongkong.org/files/65787322969.pdfIn PDF document text
    • http://meble-tk.pl/userfiles/file/navuzip.pdfIn PDF document text
    • https://stradatextiles.com/upload/ckfinder/files/tufuged.pdfIn PDF document text
    • http://wcsps.com.tw/ckfinder/userfiles/files/werunanimepo.pdfIn PDF document text
    • https://birudongker.com/contents/files/81929130655.pdfIn PDF document text
    • http://bunny888.com/ckfinder/userfiles/files/67258977896.pdfIn PDF document text
    • https://sukaunited4d.vip/contents/files/jumivamozugesirabizufo.pdfIn PDF document text
    • https://avukat.dnsaktif.net/upload/files/jabopalova.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b6f40b0304---vazidam.pdfIn PDF document text
    • https://www.fangjin.org/ckfinder/userfiles/files/lapajoj.pdfIn PDF document text
    • http://xn--h49al33a2zdp0eo1x.com/DATA/file/20210907110249.pdfIn PDF document text
    • http://keletunderground.hu/images/uploaded_pics/file/52479584016.pdfIn PDF document text
    • http://pokemom2.com/uploads/files/93504268700.pdfIn PDF document text
    • http://terrietanaka.com/library/files/bijeladirawinuge.pdfIn PDF document text
    • https://havadisname.com/upload/ckfinder/files/potot.pdfIn PDF document text
    • http://zjbfjt.com/upload/files/33103195603.pdfIn PDF document text
    • http://bigdoughpizza.com/uploads/files/vasizabaminitapexuwarexo.pdfIn PDF document text
    • http://fujieshubao.com/zk/UploadFile/file/2021090709263873499.pdfIn PDF document text
    • http://elitk.ru/_files/lopozexezigeroz.pdfIn PDF document text
    • http://l-max.ru/userfiles/file/81961310588.pdfIn PDF document text
    • https://diarch.in/WYSIWYGImage/file/rawapodo.pdfIn PDF document text
    • http://popmetre.com/news/files/25634525112.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=indiana+jones+and+the+temple+of+doom+online+freePDF link annotation
    • 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b84a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB84A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d061.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD061 10844 bytes
SHA-256: 95cef2fef2012e52dc37032599c60d2c7661169c1964db5ceac8dcb651728287
font_02_sfnt_off0000e918.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE918 16728 bytes
SHA-256: 8dce978ffe142280a876cab0e2dd46749b7174a64172c7090544696b6d2c6fbe