Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9f48a2e304e39f1…

MALICIOUS

PDF

86.0 KB Created: 2021-09-14 02:13:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 23bc33d2f9583c9d52cfb2be91d7a10c SHA-1: 52b1b0f1de2e07085f4231d7bf5d5c492cdb5502 SHA-256: d9f48a2e304e39f11b093556c719cca74881cb1ff60458fb8aa29a2690470911
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which are hosted on disposable domains and utilize UTM parameters, indicating a likely phishing or malware distribution campaign. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM further supports this, identifying the PDF as a link farm on disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://pistant.ru/uplcv?utm_term=reading+comprehension+multiple+choice+pdf PDF link annotation
    • http://elcampoeco.org/FCKeditor/file/25081916727.pdfIn PDF document text
    • http://dunakeszi.varosom.hu/userfiles/files/vofolekuj.pdfIn PDF document text
    • https://ost-fogging.com/upload/files/wuzuzulejirurezawifodeve.pdfIn PDF document text
    • http://vedepcuaem.com/luutru/files/sefubiwel.pdfIn PDF document text
    • http://fc-junajted.com/upload/datoteke/bekujipilewuwerikabafeda.pdfIn PDF document text
    • http://ngocminhcnc.com/demo_thietbimay_24_7/upload/files/18552414918.pdfIn PDF document text
    • http://igigeothermal.jp/userfiles/file/jatubosadabapa.pdfIn PDF document text
    • https://bangvetthuong.com/luutru/files/70835534607.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/161313bb632a82---80867669149.pdfIn PDF document text
    • http://hrt-foto.hu/_user/file/xisevetaxosoduxinaxerogug.pdfIn PDF document text
    • http://suamanhinhlcd.net/userfiles/file/bugojarozete.pdfIn PDF document text
    • http://recko.ru/ckfinder/userfiles/files/31038140103.pdfIn PDF document text
    • http://dglytbt.com/upfolder/e/files/20210901050252.pdfIn PDF document text
    • http://alkanboya.com/files/file///3637115084.pdfIn PDF document text
    • http://hcvitamin.com/webroot/img/files/42340808001.pdfIn PDF document text
    • https://hongming-eco.com/userfiles/file/siluzin.pdfIn PDF document text
    • https://chokysitohang.com/Uploads/userfiles/files/rifubagulepokutu.pdfIn PDF document text
    • http://groupkaishan.com/d/files/42578717122.pdfIn PDF document text
    • https://roofmed.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613ec2d242422---44106168938.pdfIn PDF document text
    • http://koala-al.com/d/files/wovavelagenebil.pdfIn PDF document text
    • http://www.pvvc.cz/files/zaropit.pdfIn PDF document text
    • https://hanedantoptan.com/upload/files/23212092786.pdfIn PDF document text
    • https://corcreation.twbiz.me/data/fckeditor/files/20210908_095543.pdfIn PDF document text
    • http://jiendurancecoaching.com/ckfinder/userfiles/files/16952202446.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_off0000e945.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE945 18044 bytes
SHA-256: c664768173e4051f5165dd801e3c4d12f6f505cda25ecfcc00086d99d818c2c9
font_01_sfnt_off0001181b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1181B 11212 bytes
SHA-256: e884453384306ca8cd79b5ea9643a9b22845e567de984bf5bb6d38ba41071fb2
font_02_sfnt_off000131e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131E5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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