Malicious PDF — malware analysis report

Static analysis result for SHA-256 1121b4e3e51c6ca8…

MALICIOUS

PDF

80.6 KB Created: 2021-09-14 18:03:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 7232b5bfb69847eca23640e1992129ee SHA-1: 442da6ef3ff2610e3854c180867647f098a375f0 SHA-256: 1121b4e3e51c6ca8d151c224dacb3876a25f498099bba6cb8ed85782140212c4
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://synerhu.ru/uplcv?utm_term=download+pes+2021+apk+latest+version PDF link annotation
    • https://demo-calson.garment-pro.com/ckfinder/userfiles/files/47067728833.pdfIn PDF document text
    • http://studiotecnicodambra.eu/userfiles/files/rixogeki.pdfIn PDF document text
    • http://sky1981.com/asset/uploads/files/fubukatekasi.pdfIn PDF document text
    • http://5mal4.de/moneyvidya/web/images/userfiles/file/89236406827.pdfIn PDF document text
    • http://kanalizace-ul.cz/userfiles/file/pelusomolowupomon.pdfIn PDF document text
    • http://pincailight.com/zk/UploadFile/file/2021090805023273499.pdfIn PDF document text
    • https://ssmahavidyalaya.org/lion/uploadedfiles/fck/files/file/52869027736.pdfIn PDF document text
    • http://mutitar.com/user_img/files/purizemuxalitexaxivuxaj.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131ad7521353---93552487337.pdfIn PDF document text
    • https://luxesystem.site/js/ckfinder/userfiles/files/fenijifegu.pdfIn PDF document text
    • https://grdr.org/paidel/ckfinder/userfiles/files/43005394152.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/161338a5957c41---luvaxagobujugigofi.pdfIn PDF document text
    • http://df-2.de/images/daten/file/niwapujeripolisu.pdfIn PDF document text
    • http://makairways.in/home/makairways2017/public_html/dowalumniusa/ckfinder/userfiles/files/pitinilewetilufurogugu.pdfIn PDF document text
    • https://nikoljski.com/ckfinder/userfiles/files/61669613202.pdfIn PDF document text
    • https://motodubai.com/uploaded_images/files/15335612557.pdfIn PDF document text
    • http://biomedia.asia/upload/ckimage/files/4584737990.pdfIn PDF document text
    • http://ebsenglish.net/_UploadFile/Images/file/jagun.pdfIn PDF document text
    • http://xn--80aikni6a0b.xn--p1ai/images/file/27829791306.pdfIn PDF document text
    • https://tapuionoticias.com/ckfinder/files/jexagazodiriwi.pdfIn PDF document text
    • http://etnorom.hu/pictures/60909564880.pdfIn PDF document text
    • http://xn--krmer-dnnebacke-1kb72b.de/files/file/47570506945.pdfIn PDF document text
    • http://www.moyekolodin.com/files/godulaxudi.pdfIn PDF document text
    • http://electriccityusa.com/images/fck_uploads/file/gipanupiwetebivaguwofabiw.pdfIn PDF document text
    • 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_off0000d602.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD602 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE14 17412 bytes
SHA-256: df1210feded8e553a65cffbd7ca013fbe7dfd85eaf741cc25290310595b11ba9
font_02_sfnt_off00011ad4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AD4 10924 bytes
SHA-256: 739ef45f2f9072b10c0304f7300ccdace79dc9ea61eb33a5ee74c38dcdb2a5fd

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