Malicious PDF — malware analysis report

Static analysis result for SHA-256 dccf15cb74c47913…

MALICIOUS

PDF

82.5 KB Created: 2021-09-12 02:14:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f598fef06ebc472c02336c9ee0e6b40e SHA-1: 99907c377c11385420cdcb39453be2d431d844f0 SHA-256: dccf15cb74c47913c1a2c05304d6a4085100f0c6af5906b9e9b7763647fff752
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable hosting or link farms, indicating a likely attempt to redirect users to malicious sites. The PDF structure and the presence of external URIs suggest it's designed to exploit users through deceptive content or by leading them to phishing pages.

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 http://ideal-site.ru/userfiles/file/kemunobesoku.pdf In PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/bc1545d7d195276e1ca3d9ce22048b7e/17837007901.pdfIn PDF document text
    • https://gberwanda.com/gbe/useruploads/blogs/files/80196396702.pdfIn PDF document text
    • https://fundacjanadzieja.com/images/wyswig_images/file/79761434102.pdfIn PDF document text
    • https://associazionebriciole.it/public/file/bidibekudevexurip.pdfIn PDF document text
    • http://cdmatik.com/uploads/file/41974440508.pdfIn PDF document text
    • http://em-mould.com/ckfinder/userfiles/files/vajedokikosisorufojexosa.pdfIn PDF document text
    • https://gertiesbloomers.com/kousumi/nulook/upload/fckimages/file/67108884915.pdfIn PDF document text
    • http://artospace.com/pics/file/61239552680.pdfIn PDF document text
    • http://rowadhr.com/app/webroot/upload/files/51930576208.pdfIn PDF document text
    • https://dbmotorbrokers.com/userfiles/file/29328913862.pdfIn PDF document text
    • https://securitydm.eu/slicice/file/wubarebabowenero.pdfIn PDF document text
    • http://gniortho.com/files/Upload/file/58635670726.pdfIn PDF document text
    • https://www.kuwaitpolyurethane.com/ckfinder/userfiles/files/jonawofijoxixi.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16130bde0ce1f6---gusalotodu.pdfIn PDF document text
    • http://gz-theoutfit.com/UploadFiles/FCKeditor/20210908194956.pdfIn PDF document text
    • http://nedirajtebosnu.net/userfiles/file/zotaridikijagelob.pdfIn PDF document text
    • http://www.introspekta.si/ckfinder/ckeditor_uploaded_files/files/lijojafaxekok.pdfIn PDF document text
    • http://sbnjl.com/userfiles/files/papejijujeratuk.pdfIn PDF document text
    • https://parfumzone.ro/files/file/24658488618.pdfIn PDF document text
    • https://rhuyscampingcar.fr/images/files/sizosipazuxabufatujowitub.pdfIn PDF document text
    • http://drukarnia-skawina.pl/app/webroot/media/files/tomemukirozojeg.pdfIn PDF document text
    • http://cn-daomeng.com/upload/userfiles/files/8bccdc5ff75bb9442a0ccf1dcbe3a16e.pdfIn PDF document text
    • http://jedzenie365.pl/ckfinder/userfiles/files/monoxoxorujiraterudo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=minecraft+guide+to+creative+pdf+freePDF link annotation
    • 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_off0000dbd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBD0 10740 bytes
SHA-256: 15b86a530c682674ce2a37fe275e54be9c80cff833cab23871336d0f1ff2c3c0
font_01_sfnt_off0000f472.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF472 18312 bytes
SHA-256: d3a4a94268700aab812140075fad891d09f1ee0462a28ffd1679c56ad23f7847
font_02_sfnt_off0001242c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1242C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1