Malicious PDF — malware analysis report

Static analysis result for SHA-256 546334d6874a2766…

MALICIOUS

PDF

90.8 KB Created: 2021-09-16 05:22:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 089a5017dfa3c741d0fb76d2b63270b3 SHA-1: bbbc7ebed6b4dc56e01882b88fc8a0764b61b844 SHA-256: 546334d6874a27663b602d4e1532a33ccd20f47fb5e7295c3acae3903b6546fd
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to distinct hosts, indicative of a link farm. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this is a tactic to obscure malicious destinations. ClamAV detection and ML classification confirm its malicious nature, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://daiichilogistics.com/uploads/news_file/gadibimanerotez.pdf In PDF document text
    • http://dishandspoonproductions.com/ckfinder/userfiles/files/24558288977.pdfIn PDF document text
    • https://minhkygroup.com/luutru/files/66039486365.pdfIn PDF document text
    • https://vietnaminsight.biz/ckfinder/userfiles/files/pofij.pdfIn PDF document text
    • http://teplorium.su/userfiles/file/70119905412.pdfIn PDF document text
    • http://lamardaegu.com/upfile/user/file/seluwuxobigojewefe.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614268c404e09---22698516112.pdfIn PDF document text
    • https://jewfri.kr/files/image/files/pevavomo.pdfIn PDF document text
    • http://snailgame.ru/upload/files/20210914171445.pdfIn PDF document text
    • http://studioguidobarbieri.it/userfiles/files/83467248693.pdfIn PDF document text
    • http://ominocoibaffi.it/userfiles/files/22800760342.pdfIn PDF document text
    • http://sp3siemianowice.pl/userFiles/files/jaroxefikos.pdfIn PDF document text
    • https://riolisboa.com/images/ul_files/file/wKmuRZfgQlBW.pdfIn PDF document text
    • http://lejuriste.ru/files/file/goferozalagixofob.pdfIn PDF document text
    • https://hojoairport.com/images/file/bewapevigajatolakevovida.pdfIn PDF document text
    • https://rtvpuls.com/ckfinder/userfiles/files/35538244323.pdfIn PDF document text
    • https://gcr.goldcrownresort.com/magazine_files/files/xitikirazapeziwusabirulo.pdfIn PDF document text
    • http://tienphat.vn/imagesflashupload/file/boridutusuvijejakase.pdfIn PDF document text
    • http://laureysnv.be/uploads/files/podevezerefalekubum.pdfIn PDF document text
    • http://karimeh.com/public/userfiles/file/kuwulovojifozasu.pdfIn PDF document text
    • http://midoriku.zaitakunet.jp/app/webroot/upload_images/files/pijalojewasuxazugaxatedur.pdfIn PDF document text
    • http://shqinze.net/admin/upimg/file///pijipevotixasotosixa.pdfIn PDF document text
    • https://rafaellopezehijo.com/upload/files/xijokitutabodivipopib.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161371d045f274---redozufipepanilomutal.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=pubg+mobile+hack+gameloopPDF 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_off0000fee2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEE2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000116f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116F9 10684 bytes
SHA-256: 1c1908dc88b5c5d27fbfb6e5128ef8a07d09359f64d7cf6fada50846a494e290
font_02_sfnt_off00012f33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F33 17764 bytes
SHA-256: 8b62f7f0ae089b8c63a4cffbbb0ebb39f1594d117dada2c34d968408a557feab