Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a83503fe68175af…

MALICIOUS

PDF

77.5 KB Created: 2021-09-19 20:35:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: aeb8b43d71c828385b87bda93cf2eb88 SHA-1: 2d20f325b6a6468f0ab4730dcbf1b0d21f6dbfb3 SHA-256: 5a83503fe68175afb4aabf4907c0cf66121e5ecacd29bc2f323b106ce9cd3b53
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It contains numerous external URIs and is structured as a link farm on disposable hosting, strongly suggesting it's part of a phishing or malware distribution campaign. The embedded URLs are likely used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 https://irlanc.ru/uplcv?utm_term=tesco+clubcard+app+for+android PDF link annotation
    • http://allasclub.com/campannas/file/mosilowibimavusipod.pdfIn PDF document text
    • http://apsara.ru/userfiles/file/78300861599.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/64019327670.pdfIn PDF document text
    • http://damnoen.com/ckfinder/pho/files/96212813642.pdfIn PDF document text
    • https://mami-m.com/Uploads/userfiles/files/72568087718.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613244cdd6346---rozarasanotalamuritemos.pdfIn PDF document text
    • https://aodaixuan.vn/app/webroot/upload/image/files/zawiluxi.pdfIn PDF document text
    • https://acrgroup.nl/userfiles/file/sagamolizefefu.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/botoder.pdfIn PDF document text
    • http://alptw.com/images/files/77821158717.pdfIn PDF document text
    • http://zjgyuanhong.com/v15/Upload/file/20219132057408528.pdfIn PDF document text
    • http://tyextractor.com/d/files/gogisa.pdfIn PDF document text
    • http://www.frank-diagn.hu/userfiles/files/wikebefidovebijodufi.pdfIn PDF document text
    • https://slotpt2.com/contents/files/denogirude.pdfIn PDF document text
    • https://bor-diing.com/upload/files/padawifubebitudeg.pdfIn PDF document text
    • http://xn--9n2bn9mz3aba29g44r4o0a.kr/fckeditor/userfiles/image/monekigefefelabokimiwisus.pdfIn PDF document text
    • https://emenu.hu/editor_up/10606353435.pdfIn PDF document text
    • http://martonaroniskola.net/userfiles/file/55730358472.pdfIn PDF document text
    • https://clickbox.ro/images/file/wimomefetinufefuk.pdfIn PDF document text
    • http://noxsun.com/jingkelun/userfiles/files/20210902040851.pdfIn PDF document text
    • http://www.sport-konyv.hu/userfiles/file/98033145295.pdfIn PDF document text
    • http://xn--80aafbjcazdrhzgiddbbcsg4l.xn--p1ai/pict/file/64502066918.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_off0000c9ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9CE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e1e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1E5 10716 bytes
SHA-256: 0558c23369cbd9d8ebae8a54511db3fa2c95db4d1b918a6193b4588cf7c6282c
font_02_sfnt_off0000fa57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA57 17892 bytes
SHA-256: 755e0d2f9210dc6e08d6a4d86ab06e54df48f942b785f3bbe3b968e9443c6e71

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