Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2b882f033089bac…

MALICIOUS

PDF

68.5 KB Created: 2021-09-25 15:32:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ef3cf39b1a44ee7b5798d15b1161a9c3 SHA-1: e25c4975058f6a36589690a8cbfcfefde1f081aa SHA-256: d2b882f033089bac12bcff4d0cd0e7bafe2a0ecc5df065aaa585f59caeacd915
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, with a significant heuristic firing indicating it functions as a link farm on disposable hosting. While no scripts were explicitly extracted, the nature of the PDF and its embedded links suggest it is designed to redirect users to potentially malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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://dobski.pl/userfiles/file/44835286234.pdf In PDF document text
    • https://medicentrumnz.eu/medicentrum/files/file/jezikikilusose.pdfIn PDF document text
    • http://dentish.ru/ckfinder/userfiles/files/mererulafubakozupabi.pdfIn PDF document text
    • http://topstec.com/d/files/60047739512.pdfIn PDF document text
    • http://schokoladenfontaene.de/idata/besirukewijok.pdfIn PDF document text
    • http://pnktools-th.org/ckfinder/userfiles/files/79843242785.pdfIn PDF document text
    • http://royalgroup.at/tmp/finopamuputazizi.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/174386955.pdfIn PDF document text
    • http://mobil-tech.com/files/gorek.pdfIn PDF document text
    • http://piazzademarini3ge.com/userfiles/files/sinutolunititajupex.pdfIn PDF document text
    • http://hansungidschool.com/userfiles/file/76131202642.pdfIn PDF document text
    • https://rzfmuhasebe.com/userfiles/file/lututu.pdfIn PDF document text
    • https://elemental-ia.com/userfiles/file/5814857249.pdfIn PDF document text
    • https://cian.hr/userfiles/file/11303953326.pdfIn PDF document text
    • http://ezclasssites.com/var/wwww/dev-ezclasssites-com/data/files/sifutatiwowasuwebirujunob.pdfIn PDF document text
    • https://zhansq.cn/upload/file/kawifudopitubosajo.pdfIn PDF document text
    • http://autoset66.ru/admin/ckfinder/userfiles/files/papagadopaparagi.pdfIn PDF document text
    • https://ingatlansos.hu/images/userfiles/file/771849059.pdfIn PDF document text
    • http://www.companyforte.com/imagenes/editor/file/gulugokukewomelox.pdfIn PDF document text
    • http://handgun.ee/media/file/pesuvofupasewo.pdfIn PDF document text
    • https://fullhousetourism.com/UploadFiles/file/20210905164949124.pdfIn PDF document text
    • https://inprovitargentina.com/ckfinder/userfiles/files/riboba.pdfIn PDF document text
    • https://www.sterlingsez.com/ckfinder/userfiles/files/dejumoteraninafugiva.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/8b6090d0e0e7884caa658fc40f4cefe4/sukoxagugivusun.pdfIn PDF document text
    • http://cosyromania.com/media/file/fizesukotaxarinojolemawit.pdfIn PDF document text
    • https://communeouchamps.fr/userfiles/file/tefemofum.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=android+11+clear+bluetooth+cachePDF 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_off0000b012.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB012 10572 bytes
SHA-256: 0270bf899ab3e06a7d9740b5b0a164c096bc2cac39deb55a341a9ae32786500f
font_01_sfnt_off0000c822.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC822 14480 bytes
SHA-256: bc7a4c145e6db983a09d36179a89e8d283c0395a502b2a508f4e66c8ba1f9542
font_02_sfnt_off0000ec69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC69 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1