Malicious PDF — malware analysis report

Static analysis result for SHA-256 55d362349aa8f465…

MALICIOUS

PDF

83.0 KB Created: 2021-09-20 10:05:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 3aa77d4dfe91c249e429c807fce08818 SHA-1: 802b5ca0829214f8fbed6fc27c5d6afd889ccb32 SHA-256: 55d362349aa8f46576823d6fa4a0e5487b1457961843fee005171f072861b93d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, with the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicating a high density of links across many domains. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the structure and URL patterns are indicative of a malicious PDF designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://thietbixanh.net/uploads/files/kasizaj.pdf In PDF document text
    • http://snbedu.com/uploadfile/file///2021091514513012.pdfIn PDF document text
    • http://fpole.ru/sadm_files/didijezozewebidas.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613192fe049b2---jatijotetuxizunujegiwafuw.pdfIn PDF document text
    • http://medianet2000.net/amm_prod/image_news_popup/file/67662819936.pdfIn PDF document text
    • http://audyt.rowerowaszkola.pl/imgturysta/files/dovujafivataguganaruwuf.pdfIn PDF document text
    • https://esvigo.com/upload/files/ropuzipevu.pdfIn PDF document text
    • https://altstudio.be/app/webroot/uploads/file/renagodugiresal.pdfIn PDF document text
    • http://zvezda-rostov.ru/ckfinder/userfiles/files/18533778383.pdfIn PDF document text
    • https://dalilak1.com/userfiles/file/wobigososamuwafaruzibud.pdfIn PDF document text
    • http://optimaglobal.net/ckupload/files/nazarovafiwuremanizopakik.pdfIn PDF document text
    • http://bigcool.net/webroot/img/files/solodinesejonalojom.pdfIn PDF document text
    • http://tydafa.com/dafa/uploadfiles/20210910083140.pdfIn PDF document text
    • http://healthywithhart.com/res/file/gopatuwepo.pdfIn PDF document text
    • http://fabtur.ru/upload/files/wutaxisetoromigabimej.pdfIn PDF document text
    • http://barudan.hk/UploadFile/file/20210902015753993.pdfIn PDF document text
    • https://monyetmesum.com/contents/files/10343039453.pdfIn PDF document text
    • https://dolnoslaskialarmsmogowy.pl/imgturysta/files/tutojuniw.pdfIn PDF document text
    • http://ninda.vn/userfiles/files/bukasujamigekawuzuj.pdfIn PDF document text
    • https://beautifulhairstore.com/upload/files/zikigazijedolekoxa.pdfIn PDF document text
    • https://drproperty.in/userfiles/file/jesomazevofokironirumona.pdfIn PDF document text
    • https://winpoasia.com/ckfinder/userfiles/files/mubarejigunepusave.pdfIn PDF document text
    • http://minerva-collection.net/files/files/91501399838.pdfIn PDF document text
    • https://kermanrooz.com/img/files/84194652684.pdfIn PDF document text
    • https://oxfordjsr.com/userfiles/file/zulejanikufogilusuk.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=allcast+receiver+for+pc+free+downloadPDF 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_off0000de29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE29 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f640.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF640 10748 bytes
SHA-256: ed621f46c31ca36ae207895b403a9ac9d2483aba4edde1487f7b5f67a77a07a2
font_02_sfnt_off00010f30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F30 17332 bytes
SHA-256: 0c71d39d112a5449bf76894164b96643929d147507de60b6753481f6949c438e

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