Malicious PDF — malware analysis report

Static analysis result for SHA-256 53f2b77c3ac4193b…

MALICIOUS

PDF

85.7 KB Created: 2021-09-11 01:32:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 319d225dbbd6f8c85e3e86025d1ede83 SHA-1: ceb7732cdd5ff087b96d4feabe8f26b0c9633f94 SHA-256: 53f2b77c3ac4193b6da87ad108003fb01e3f6f0fbcec53991d5c01d51475d91d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm, a common tactic for phishing or distributing further malware. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to redirect users to malicious content, likely exploiting the user's trust in document attachments.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://bienenaktuell.com/sites/bienenaktuell.com/files/file/62602300363.pdf In PDF document text
    • http://go-pxl.com/uploads/files/92922135538.pdfIn PDF document text
    • https://parlagame.net/calisma2/files/uploads/78959029271.pdfIn PDF document text
    • http://aytekinpolatel.com/image/files/nafotamozisivinibemusasuv.pdfIn PDF document text
    • http://studiotecnicoarduini.eu/userfiles/files/pituzasezodowapiwigu.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/3631d2bb012b3a4d3e298321faf44e88/letaliwevonewo.pdfIn PDF document text
    • https://gospel-streams.com/asset/ckfinder/userfiles/files/30414159316.pdfIn PDF document text
    • https://tatsolarlight.com/uploads/files/92613735461.pdfIn PDF document text
    • http://giaexploring.it/userfiles/files/kafomakov.pdfIn PDF document text
    • http://energosol.pl/images_cms/file/98980466308.pdfIn PDF document text
    • http://salon-urody-bellis.pl/images/file/vumimaxolopufebakuz.pdfIn PDF document text
    • https://cambodiadriverservice.com/userfiles/file/66150575910.pdfIn PDF document text
    • http://cathugo.de/res/wysiwyg/file/531488882.pdfIn PDF document text
    • https://menu2uplus.com/images/file/77527259517.pdfIn PDF document text
    • http://bdsps.org/slbdavbatala/userfiles/file/57386941924.pdfIn PDF document text
    • http://sushimura1.com/uploads/files/movuxonejurivasudid.pdfIn PDF document text
    • http://uniradioweb.info/userfiles/files/mesupakegubevefigut.pdfIn PDF document text
    • http://cbcom.fr/ressource/site-image/files/vufupenivafafezokolo.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/7fc3a7d96aaec050390a5098bc83e02b/73225843882.pdfIn PDF document text
    • https://rolcsi-bau.hu/userfiles/files/28455056837.pdfIn PDF document text
    • https://qualityroofinnandsuites.com/nbloom/fckuploads/file/8896034787.pdfIn PDF document text
    • http://deeringbayrealestate.com/userfiles/files/wusaluvovaf.pdfIn PDF document text
    • http://chapraptti.org/userfiles/file/wuletidelipomudumarik.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=hotspot+on+iphone+xr+not+workingPDF 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_off0000e940.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE940 18160 bytes
SHA-256: 8ea373d1eec16c8caedb199b79be621c995c5fb4a3f1881208680cddc446d19e
font_01_sfnt_off00011887.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11887 10596 bytes
SHA-256: bb53fd17be39b81393f64261e4432bef8db034b02314513a2d9dd72e60c65278
font_02_sfnt_off000130be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130BE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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