Malicious PDF — malware analysis report

Static analysis result for SHA-256 045c356985fd5c39…

MALICIOUS

PDF

83.3 KB Created: 2021-09-20 04:57:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 57965780882634d343bf7e689b32184e SHA-1: bc4076cccb0acbf3de04121510684d0e4e9cd32d SHA-256: 045c356985fd5c3928b5c5b84313889bb7afcf1cbda3edd3f25da98df070e768
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The presence of numerous embedded URLs, many pointing to disposable hosting and forming a link farm, suggests a phishing or redirection scheme. The document body is heavily obfuscated and unreadable, further supporting the malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://watthaistuttgart.de/userfiles/file/64436403211.pdf In PDF document text
    • http://www.ondebiz.com/userfiles/file/26982850857.pdfIn PDF document text
    • http://kovove-ploty-brany-zabradli.cz/UserFiles/File/pawurogazitobugezadotegij.pdfIn PDF document text
    • http://af.ssla.ru/images/fornews/files/66498485259.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/16140baae856c4---34591438475.pdfIn PDF document text
    • http://hglobaltour.com/FileData/ckfinder/files/20210917_FDE05211FB857AC4.pdfIn PDF document text
    • https://secolink.sk/userfiles/file/7961892191.pdfIn PDF document text
    • http://wenxuezj.com/images/File/11203999494.pdfIn PDF document text
    • http://yurisolomko.com/userfiles/file/zunikurez.pdfIn PDF document text
    • http://agrobud.net/uploaded/file/futipetujatotaralireb.pdfIn PDF document text
    • http://cyklo-sport-servis.cz/UserFiles/File/1569159889.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/1b53e875jjktdpb0simbnpkt1a/puzulikibutewugifunu.pdfIn PDF document text
    • https://braveathlete.net/geektic/files/jaditubezimoto.pdfIn PDF document text
    • http://balaton.varosom.hu/userfiles/files/tinalijinulujegazajaz.pdfIn PDF document text
    • http://etenindex.nl/images/uploads/mizowedilajizeri.pdfIn PDF document text
    • http://www.petersonassoc.com/emailimages/file/55106729150.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/161417284f09bd---78617020836.pdfIn PDF document text
    • https://nbcmedia.vn/ckfinder/userfiles/files/zoradulagisexufijizi.pdfIn PDF document text
    • https://xtrafitcoaching.com/www/images/files/89231982459.pdfIn PDF document text
    • http://hyunsin.net/userfiles/file/50332957208.pdfIn PDF document text
    • http://mextro.de/upload/files/buzijanuporubigajogag.pdfIn PDF document text
    • http://www.egymast-segito.hu/uploaded/fck/file/21135278757.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=android+emulator+for+iosPDF 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_off0000e12f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE12F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f946.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF946 10596 bytes
SHA-256: 1f4f2920ff79fd22ea0471719956a456864e7de2f4c7e865b9fd9982b45f4a84
font_02_sfnt_off0001117d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1117D 18072 bytes
SHA-256: a9615077004570311abcacc04609060cc44cb62b4f5c6261c494618a3e1e9d79

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