Malicious PDF — malware analysis report

Static analysis result for SHA-256 39e1ec985837e134…

MALICIOUS

PDF

83.3 KB Created: 2021-09-22 16:04:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 57ef8e3378299c59bb7ba8fcdbf16335 SHA-1: 444e0ca9efa89d376062bce0c93405fc0f662a55 SHA-256: 39e1ec985837e134c4e3d1ca849e45ab006f4f220e2c0d57a68a4a08864ba971
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, specifically identified as a phishing trojan. It contains numerous embedded URLs pointing to disposable hosting, characteristic of a link farm designed to redirect users to malicious sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicates this malicious intent.

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://allytemp.ru/uplcv?utm_term=demon+slayer+infinity+train+english+dub+full+movie PDF link annotation
    • https://smartcrm.cloud/upload/files/10585385402.pdfIn PDF document text
    • http://bjavc.com/filespath/files/20210916032852.pdfIn PDF document text
    • http://formel1vermietung.de/userfiles/file/marinakadem.pdfIn PDF document text
    • https://pasationtravellers.com/root/FCKeditor/file/kolofupisagazux.pdfIn PDF document text
    • http://doubles301.jp/files/ckeditor/files/86382928911.pdfIn PDF document text
    • https://copacndg.com/images/uploads/files/95842707625.pdfIn PDF document text
    • http://biplano.eu/userfiles/files/39307664146.pdfIn PDF document text
    • http://antonellascarpittadesigner.it/userfiles/files/41836369400.pdfIn PDF document text
    • https://sanipro.ma/app/webroot/uploaderfiles/9139265648.pdfIn PDF document text
    • https://tomas-music.com/contents/files/73286888434.pdfIn PDF document text
    • https://mariellatriolo.it/public/file/kazusexuduvaxo.pdfIn PDF document text
    • http://cp-tournament.org/ckfinder/userfiles/files/48380806916.pdfIn PDF document text
    • http://frankifoto.com/uploads/pages/files/3492866738.pdfIn PDF document text
    • http://telegid.tv/userfiles/files/61623455009.pdfIn PDF document text
    • http://rtm-plus.ru/ckfinder/userfiles/files/lawojamero.pdfIn PDF document text
    • http://betonkeritesek.eu/Content/files/ludafikosukiji.pdfIn PDF document text
    • https://hexema.com/FCKeditor/file/jegibifatukogadokati.pdfIn PDF document text
    • http://plenerowe.kbo.pl/ckfinder/userfiles/files/folozajuzevizabirarolibe.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/sbj02osp04ngsus3i4k3lurl1c/genetetiru.pdfIn PDF document text
    • http://quincy.pl/ckfinder/userfiles/files/zarotilisuxuxifigalo.pdfIn PDF document text
    • http://ourgans.org/userfiles/files/tobapa.pdfIn PDF document text
    • https://questyme.com/userfiles/file/zedozos.pdfIn PDF document text
    • http://ckud.handysociality.com/upload/files/39880774624.pdfIn PDF document text
    • http://mellorymotors.ru/admin/ckfinder/userfiles/files/kimakugezimiwasarokalidar.pdfIn PDF document text
    • http://appartementslisa.it/an3_Uploads/file/68954646564.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_off0000d65c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD65C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE73 11220 bytes
SHA-256: b2506ba2750fe4494a5a5371445d1703dd97d396a47fb7977aa851f1e84bc444
font_02_sfnt_off00010859.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10859 20688 bytes
SHA-256: 7dbe124bca84936c3b298d4b7f41b69c9331145b1dafa7d02601b180d8b0aac1

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