Malicious PDF — malware analysis report

Static analysis result for SHA-256 f40d9d18463ab9e5…

MALICIOUS

PDF

82.5 KB Created: 2021-09-15 17:49:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: ee86a61006196eed8a53863886058ba8 SHA-1: 44a3154d4d75ce21482330587f1e37fcc16c6f0a SHA-256: f40d9d18463ab9e550190cb02a7eee21692121c6782e0414b14b6249d59fae93
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The document contains numerous embedded URLs pointing to a link farm, with one heuristic identifying it as a disposable link farm. While no scripts were explicitly extracted, the presence of numerous external links suggests an attempt to redirect the user to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

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 http://diysmart.net/userfiles/file/69667130467.pdf In PDF document text
    • http://avandcie-automation.fr/ckfinder/userfiles/files/16170079372.pdfIn PDF document text
    • http://churchtextile.com/userfiles/file/62941862544.pdfIn PDF document text
    • https://rmp-familienanzeigen.de/cms/files/78489539509.pdfIn PDF document text
    • http://www.huescalamagiaenfotos.com/userfiles/files/81606700717.pdfIn PDF document text
    • https://groupburuemas1.com/contents/files/29009081026.pdfIn PDF document text
    • https://bomando.bomsolar.com/uploadfiles/files/83237536570.pdfIn PDF document text
    • http://awarelaxcentrum.cz/user_files/file/fagegizasonuzegagujaza.pdfIn PDF document text
    • http://fence-alarm.com/userfiles/files/20761641012.pdfIn PDF document text
    • http://asijskepotraviny.cz/files/file/23034866709.pdfIn PDF document text
    • http://cathugo-catamarans.de/res/wysiwyg/file/30812171097.pdfIn PDF document text
    • https://eliteplacementagency.com/uploads/files/vakanuxoviragu.pdfIn PDF document text
    • https://bibliotheque-des-arts.com/ckfinder/userfiles/files/gamibopabakogewom.pdfIn PDF document text
    • https://n-vv.dk/userfiles/file/67770520921.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/geraruxemiviwef.pdfIn PDF document text
    • https://spotiverify.com/ci/userfiles/files/79088908027.pdfIn PDF document text
    • http://altelaw.com/uploads/image/file/zabuxuva.pdfIn PDF document text
    • https://langumeistras.lt/i/File/sanebebofigidazolidunug.pdfIn PDF document text
    • http://loadcell.vn/Images_upload/files/gataxobuzijebimidubapoduv.pdfIn PDF document text
    • https://jhservice.net/imagenes/galeria/files/pogubiwivurimaputurin.pdfIn PDF document text
    • https://paklya.su/design/img/upload/file/suwomo.pdfIn PDF document text
    • https://ist-lb1.istanajp.com/contents/files/mikekod.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=portal+gun+mod+minecraft+pePDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bb3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB3E 10896 bytes
SHA-256: 0db648feeabfe54ceeb1f3968c33239c47a107f9a08e19d2628d5698d6546a2b
font_01_sfnt_off0000d436.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD436 16596 bytes
SHA-256: 45ec1575ee06371ee797f5b34c0867aaa19760467c67e3c090bb6003476ad1fc
font_02_sfnt_off0000ebb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBB4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000103c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103C6 22564 bytes
SHA-256: 6619eddd98548e352132b91f6d6337d0554bc131a70542291f4e399e4a4348f0

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