Malicious PDF — malware analysis report

Static analysis result for SHA-256 36f26adae169d628…

MALICIOUS

PDF

82.9 KB Created: 2021-09-09 17:18:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 77a1c5e9450175a2bd61bff495027cb0 SHA-1: 678a75f82b3cb85191bdeff87d96d66fed248c64 SHA-256: 36f26adae169d6284d1e930484641460ef6c132bfda993123518c9e8a2f5e722
126 Risk Score

Malware Insights

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

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to disposable domains, indicating a link farm designed to redirect users to potentially harmful content. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM strongly suggests this is a phishing or malware distribution lure.

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://inwebjor.ru/uplcv?utm_term=how+do+i+uninstall+an+app+on+my+phone PDF link annotation
    • http://bburago.info/admin/fckeditor/userfiles/file/53734014010.pdfIn PDF document text
    • http://mnarch.it/userfiles/files/55781831131.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/161301393f3383---ramanavuzeniwosum.pdfIn PDF document text
    • http://maradonasalud.com.ar/ckeditor/ckfinder/userfiles/files/tesetewilokizuz.pdfIn PDF document text
    • http://cravaluos.com/ckfinder/userfiles/files/dexonitadotebej.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/61484069571.pdfIn PDF document text
    • http://weldingplaza.com/files/file/34442938595.pdfIn PDF document text
    • http://bassonconsulting.mc/userfiles/file/34953631296.pdfIn PDF document text
    • http://plncse.hu/php_data/file/61012559450.pdfIn PDF document text
    • http://sapaelitehotel.com/webroot/img/files/rorukote.pdfIn PDF document text
    • http://kiddeefire.com/media/userfiles/files/sokavubofaman.pdfIn PDF document text
    • http://kechengchem.com/upload/files/mideju.pdfIn PDF document text
    • http://aspbae.org/userfiles/file/98314086280.pdfIn PDF document text
    • http://wawabed.pl/uploads/userfiles/file/rasizowedaw.pdfIn PDF document text
    • http://linker-apps.com/files/koxalawubemofukefoge.pdfIn PDF document text
    • http://hflchw.com/upload/file/pujurogotelatukupud.pdfIn PDF document text
    • http://mikomisushi.com/uploads/files/99727542219.pdfIn PDF document text
    • http://stadtbild-intervention.de/Quansis/ckfinder/userfiles/files/momurur.pdfIn PDF document text
    • https://www.tristar-technology.com/ckfinder/userfiles/files/4785908508.pdfIn PDF document text
    • http://vdtonline.vn/static/uploads/editor/files/fufeteguz.pdfIn PDF document text
    • http://ilkemymm.com/image/files/64651412562.pdfIn PDF document text
    • https://tfsroanoke.com/home/tfs/public_html/new/ckfinder/userfiles/files/53742583629.pdfIn PDF document text
    • http://autoscuolepintozzi.it/userfiles/files/82697812377.pdfIn PDF document text
    • https://dulsuc.cl/userfiles/file/nazajafanugamupatajakoked.pdfIn PDF document text
    • http://nikacarpet.com/My_Project/Hamishe_bahar/ahar_img/files/15489423344.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_off0000de4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE4D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f65f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF65F 17952 bytes
SHA-256: 20313c63545a3e0258e4dc6beb1b2c02cf7024f2c2bc74b46a60d07ce36ede46
font_02_sfnt_off000124a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124A8 10848 bytes
SHA-256: ab3aef12de952f7ba0d1b8b3ac1b365892446e106a834632cd5ecc09f2840597

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