Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae33f69e5ff834de…

MALICIOUS

PDF

73.9 KB Created: 2021-09-12 22:27:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: af791e8e0088f2b8bec098dd2e41b68e SHA-1: bd99d77321fa6e593c323f0adca9b5a58d068585 SHA-256: ae33f69e5ff834de7380724f8e0a6e0887aabbf7fd5a2140dc4cdcfab8f5c0b3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm on disposable hosting, with numerous embedded URLs pointing to potentially malicious content. The presence of external URIs and the overall structure suggest a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135616b6dc3f---wonogenodifu.pdf In PDF document text
    • http://daithanhnam.com/upload/files/zomaxewivutuzit.pdfIn PDF document text
    • https://maychieuvinh.vn/upload/files/5975556994.pdfIn PDF document text
    • http://tjsyjdq.com/v15/Upload/file/2021932115234139.pdfIn PDF document text
    • http://studiotecnicopinto.it/userfiles/files/22623396993.pdfIn PDF document text
    • https://expomediainc.com/upload/file/86677795701.pdfIn PDF document text
    • http://boonfagrandhome.com/user_img/files/26058760336.pdfIn PDF document text
    • http://knuhpharm.kr/userfiles/file/20210903012812.pdfIn PDF document text
    • https://quizai.com/uploads/files/vilifabisu.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/30165682587.pdfIn PDF document text
    • https://hotelpancharatna.com/assets/userfiles/files/tetanax.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/bb24a6cc644c7f789a6cedc513d2ac6e/87345073661.pdfIn PDF document text
    • http://lyzjkgm.com/d/files/wevuzenipawegaraxifiz.pdfIn PDF document text
    • http://qtjdb.com/UploadFile/2021/09/12/file/20210912_011724_181.pdfIn PDF document text
    • http://saatgaamkansarasamaj.com/admin/uploads/files/dexexojereligakop.pdfIn PDF document text
    • http://sinojjacob.com/userfiles/file/zexubuwikomofokodijezu.pdfIn PDF document text
    • http://pretaporter-pegah.com/userfiles/file/65775145631.pdfIn PDF document text
    • http://loscogliodifavignana.it/userfiles/files/42901102850.pdfIn PDF document text
    • http://chernogolovka.inhome360.ru/admin/ckfinder/userfiles/files/34616398230.pdfIn PDF document text
    • https://hoanghaie.com/Images_upload/files/ruputumesukevoxadopigas.pdfIn PDF document text
    • http://turskazka.ru/ckfinder/userfiles/files/70120034302.pdfIn PDF document text
    • http://ecole-belair.com/ecole/file/85117791315.pdfIn PDF document text
    • http://cmsrecuperocrediti.it/images/file/zafalonewevegezavag.pdfIn PDF document text
    • http://tranindo.com/Uploads/userfiles/files/36540102048.pdfIn PDF document text
    • https://urbanlivin.lu/userfiles/files/90138235109.pdfIn PDF document text
    • https://solelane.com/ckfinder/userfiles/files/sizexarogoxaxitotagapewav.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=pocket+rally+litePDF 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_off0000c09e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC09E 10156 bytes
SHA-256: 915ab802af7d3421959d7bc57ede1720487aeb194a43e497236d646282a42a12
font_01_sfnt_off0000d77f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD77F 16876 bytes
SHA-256: 6220c6ab2fb46a3dfec6d3fe7f8c2220de65532f16a722f885676a75200566cd
font_02_sfnt_off0001020c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1020C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1