Malicious PDF — malware analysis report

Static analysis result for SHA-256 f17445af060afb66…

MALICIOUS

PDF

74.6 KB Created: 2021-09-09 06:09:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 8533dbee04eb42068f146567e82c62ba SHA-1: 0d2dfb068411f6115ed5bebf4e2222b110f9c4e6 SHA-256: f17445af060afb667897ddddd0064a3797ff6072f71e37ee38af213698fc1342
126 Risk Score

Malware Insights

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

The sample is a PDF file identified as malicious by ML classifiers and ClamAV. It contains numerous embedded URLs, many of which are part of a link farm hosted on disposable domains, indicating a phishing or malware distribution attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this malicious intent. While no scripts were explicitly extracted, the nature of the embedded links and the overall structure point towards an attempt to redirect users to malicious content, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://laborke.ru/uplcv?utm_term=fnaf+6+free+online PDF link annotation
    • https://bevillelecomte.ovh/ckfinder/userfiles/files/38986548748.pdfIn PDF document text
    • http://namkhoabacninh.com/images/files/853596430.pdfIn PDF document text
    • https://samsungklima.net/upload/ckfinder/files/movelavidelorofalugejam.pdfIn PDF document text
    • http://yuanda-boiler.com/d/files/59568923153.pdfIn PDF document text
    • http://hieuchuan.com/upload/files/gajazudajafesufukuf.pdfIn PDF document text
    • http://sage-chem.com/image/files/20210904_215202.pdfIn PDF document text
    • http://decoworld.in/dayafter/uploadimages/newsimages/file/25565269320.pdfIn PDF document text
    • http://a-pro-peau.fr/userfiles/file/92717498644.pdfIn PDF document text
    • http://debseven.net/UserFiles/File/timin.pdfIn PDF document text
    • https://ssmahavidyalaya.org/lion/uploadedfiles/fck/files/file/xukerugedenafizibomug.pdfIn PDF document text
    • https://freshchannels.com/home/sites/freshchannels/public_html/ckfinder/userfiles/files/92340960633.pdfIn PDF document text
    • https://egyseg.eu/ckfinder/userfiles/files/kivamibazewi.pdfIn PDF document text
    • https://cecprint.com/images/file/lokat.pdfIn PDF document text
    • http://antansconstructions.com/ckfinder/userfiles/files/perefex.pdfIn PDF document text
    • https://pollackmihalyiskola.hu/ckfinder/userfiles/files/42741769287.pdfIn PDF document text
    • http://www.trisad.kz/ckfinder/userfiles/files/vumazemofodet.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/c88c4708c973bc7766d5643616a2e320/pafufiliguvarutuxikujakad.pdfIn PDF document text
    • http://www.mattig-accounting.bg/fisiere/file/damixiwesuladu.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/161394e0128466---10226077226.pdfIn PDF document text
    • http://iraneto.com/basefile/iranetocom/files/zotivinozojuxo.pdfIn PDF document text
    • http://kapsalonvogue.nl/files/file/misufakibotibekopoginim.pdfIn PDF document text
    • https://shreenathtechnologies.com/userfiles/file/godotefopezuvekavimij.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_off0000c24b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC24B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000da5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA5D 17148 bytes
SHA-256: bea74d5c722189784d7cdac60cf03de2dc2740bf4a8f3e99ee0e1ba958a27b5c
font_02_sfnt_off0001069d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1069D 10088 bytes
SHA-256: ccb91897921d22c04d27a61de88e5d5e502729e04271ad5d17706e38502f3660