Malicious PDF — malware analysis report

Static analysis result for SHA-256 dddc49799cdf2a0c…

MALICIOUS

PDF

68.5 KB Created: 2021-09-26 16:13:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 57937bdd94a36da28388eda30e1f8d3f SHA-1: 8be1c1f7900348f706863b8665b5cf799eb256a9 SHA-256: dddc49799cdf2a0cd245fcc08c3237c1fb8ff1e173fb8faedb0d5322d91ed4f6
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file containing embedded JavaScript and a large number of external URIs, many of which point to disposable hosting. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a link farm, and the ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or redirection. The embedded JavaScript is a common technique for executing malicious code or initiating further downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://philabc.ru/uplcv?utm_term=hill+climb+racing+modded+apk
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614fb27437fc9---xiwuwin.pdf
    • http://computer-rudolstadt.de/upload/file/9659397123.pdf
    • https://jyapa.com/jhuoyue/uploadfiles/90915821350.pdf
    • http://onlinecommerce.bg/uploads/pages/files/93181459376.pdf
    • http://travelci.ru/ckfinder/userfiles/files/28150423361.pdf
    • http://cherriestattoo.com/ckfinder/userfiles/files/parikinofuvosifojebasun.pdf
    • http://vasekurzy.cz/userfiles/file/9099241572.pdf
    • http://cateringkieuan.com/uploads/userfiles/file/80749181575.pdf
    • https://ap-qatar.com/userfiles/files/tokonixamul.pdf
    • http://nocleginaplus.pl/uploads/userfiles/files/zabopitewewexilodavulos.pdf
    • http://cs-golfclub.com/ckupload/files/zoxuwop.pdf
    • http://mvdeastudio.it/userfiles/files/menubin.pdf
    • https://www.fibertech1.com/my_content/js/ckfinder/userfiles/files/31537098090.pdf
    • https://datenglagi.com/contents/files/jokuxovonusanugowojeka.pdf
    • http://ricarda-allegra.de/userfiles/file/zoxesapavukagopeniwune.pdf
    • http://www.dgtrans.co.th/login/ckfinder/userfiles/files/81241507337.pdf
    • https://socardan.com/userfiles/files/ximisitusojilugagasive.pdf
    • https://matricula.arendic.cl/files/8702442789.pdf
    • https://emotionalgift.com/ckfinder/userfiles/files/tamor.pdf
    • https://xn--lenachatka-57b.pl/uploaded/file/8708909621.pdf
    • http://noahmission.org/dataroom/file/xuliwaditi.pdf
    • http://test-immo.com/file/52436558202.pdf
    • https://shian-jin.com/UserFiles/files/fotozarenowawefiwoguso.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ad25.bin
193c8acc372f29368e087af23628a073be5242130cecea7d98396b76df2ae851		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAD25 10812 bytes
font_01_sfnt_off0000c584.bin
64359c487ff26e51ed97253b283a4d9df99552f4a7d13a86caf728c4ae2a4bbd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC584 15520 bytes
font_02_sfnt_off0000ecb4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xECB4 16792 bytes

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