Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2f19faca7bdf69b…

MALICIOUS

PDF

127.4 KB Created: 2021-09-24 02:09:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 52cee7e2ff18de3885ee1e66ae387ded SHA-1: c1b224653b52c6a4f462a3cf3dde075c86d745d6 SHA-256: d2f19faca7bdf69bf0e7901d4487361d5946ddd2e27c7e830f37835cb65f1e2e
126 Risk Score

Malware Insights

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

The sample is identified as a malicious PDF by ClamAV and an ML classifier. It contains numerous external URIs, including one pointing to 'smidgel.ru', which is flagged as a link farm on disposable hosting. The PDF structure and embedded links suggest an attempt to redirect users to potentially malicious websites, likely for phishing or to download further malware. No scripts were extracted, but the presence of external links and the overall heuristic firings strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://smidgel.ru/uplcv?utm_term=android+lollipop+emulator+for+pc PDF link annotation
    • http://viprealestatebrokers.com/userfiles/files/71331225311.pdfIn PDF document text
    • https://sandp-engineering.com/ckfinder/userfiles/files/10290636355.pdfIn PDF document text
    • http://historia-bfured.hu/userfiles/file/94289408556.pdfIn PDF document text
    • http://aunay-sous-auneau.fr/ckfinder/userfiles/files/vinibututulefuzejibopifab.pdfIn PDF document text
    • http://groupelamiri.com/uploads/FCK_files/file/gemusolijotobulowulozita.pdfIn PDF document text
    • http://betheaskssd.com/flash/betheaskssd.com/file/66066202541.pdfIn PDF document text
    • https://turkuazhost.com/calisma2/files/uploads/mazos.pdfIn PDF document text
    • https://voziky-paletove.cz/mctree.cz/pictures/other/files/49354778381.pdfIn PDF document text
    • https://kovtec.pl/eurostyl/photos/file/mamusupigilafabu.pdfIn PDF document text
    • http://dar-tom.pl/userfiles/file/kujuvuxomimavut.pdfIn PDF document text
    • http://faisaltowel.com/survey/userfiles/files/towiwew.pdfIn PDF document text
    • http://dagmar-e.de/userfiles/file/betinu.pdfIn PDF document text
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/1e3ed229ea0c872289465d3a6eea566c/76597263874.pdfIn PDF document text
    • http://www.ambatownship.com/ckfinder/userfiles/files/kalavedonaxis.pdfIn PDF document text
    • https://ssekolkata.com/ckfinder/userfiles/files/55217008402.pdfIn PDF document text
    • http://nfc-lampang.com/user_img/files/vinudakaminisulesel.pdfIn PDF document text
    • http://carzip.biz/files/uploads/files/jurunarobe.pdfIn PDF document text
    • http://hangquangauto.com/files/81635032558.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/57656bb4305ca08db895b174adf82f69/1653453859.pdfIn PDF document text
    • http://sutipatika.hu/userfiles/files/1229071350.pdfIn PDF document text
    • https://mountainbrookbuilders.com/home/mountain/public_html/ckfinder/userfiles/files/2360848919.pdfIn PDF document text
    • https://zivotzaokny.eu/res/file/66646299434.pdfIn PDF document text
    • http://dentalweek.eu/userfiles/files/jukowirijajagigofijixe.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_off00018d3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18D3A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001a551.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A551 10692 bytes
SHA-256: 42e7425e88089943c2a69659b0169f55fa830146c52afcb0c5095589fabb6fd1
font_02_sfnt_off0001bdcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BDCB 18728 bytes
SHA-256: 173fca368ee6d4e206c0ede9a180003eb33267b64c3cb88984333a3bc1cc8018