Malicious PDF — malware analysis report

Static analysis result for SHA-256 47a341b383ad45aa…

MALICIOUS

PDF

79.7 KB Created: 2021-09-16 10:52:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 8da96d606eec8cda3c95462ea1fcfbd7 SHA-1: 843d8603d461dfdb2b3ace89992d635f6d1ad07c SHA-256: 47a341b383ad45aac865b0b0c42e7d5ce6eb9e07a8932de177bdd00c7080e76c
134 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. It contains numerous external URLs, suggesting it functions as a link farm or phishing lure. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a strategy to distribute malicious links across disposable hosting. No scripts were extracted, but the overall structure points to a malicious PDF designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://synerhu.ru/uplcv?utm_term=mod+real+racing+3+apk PDF link annotation
    • http://tieulongcopro.com/luutru/files/gigulizatop.pdfIn PDF document text
    • http://www.dfdtrading.sk/ckfinder/userfiles/files/timujefukilosavagoxune.pdfIn PDF document text
    • http://volker-issmer.de/userfiles/file/27611865655.pdfIn PDF document text
    • http://spodne-pradlo-2bpoint.sk/UserFiles/File/82529493891.pdfIn PDF document text
    • http://pospatrans.cz/UserFiles/File/71872018586.pdfIn PDF document text
    • http://xn--4k0b43gkwo4gn.com/upload/editor/file/1987632803.pdfIn PDF document text
    • http://narnivet.com/userfiles/files/78971534839.pdfIn PDF document text
    • https://mannerfeltdesignteam.se/ckfinder/userfiles/files/mujepuxaginalusaxa.pdfIn PDF document text
    • http://hagelkonzept.com/userfiles/file/wubelorudimok.pdfIn PDF document text
    • https://dubaimotorcycletours.dubaimotorhomerentals.com/uploaded_images/files/43840020550.pdfIn PDF document text
    • http://ty-universe.com/image/files/20210901_052502.pdfIn PDF document text
    • http://studiotecnicodama.it/userfiles/files/85053007339.pdfIn PDF document text
    • http://longarmquiltacademy.com/fckeditor/userfiles/file/43754709517.pdfIn PDF document text
    • http://wdnederland.nl/file/nolivuzimagopagan.pdfIn PDF document text
    • http://sadiqandsons.com/userfiles/files/48690001603.pdfIn PDF document text
    • http://amblesidewindermere.ca/fckuploads/images/file/50735120192.pdfIn PDF document text
    • http://cnzgks.com/userfiles/file///xepokevebet.pdfIn PDF document text
    • http://cortabellanews.com/userimages/zitujavisewix.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/5u3p37cokd1vo8sdghuqrphsv3/korovinapom.pdfIn PDF document text
    • https://tonthephunglan.vn/upload/files/92010564330.pdfIn PDF document text
    • http://quiltingacademy.com/fckeditor/userfiles/file/xibimewobenawi.pdfIn PDF document text
    • http://naturestuff.nl/siteimages/file/2734752966.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/p44goe31gui9g6gj1c96i0ab9i/felezuwewepoguxibutadob.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_off0000d0b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0B3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e8ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8CA 10680 bytes
SHA-256: 1d5b604216ce2f8397cd532c1d465a4607256d97b28924ade5f0f53abbc043a1
font_02_sfnt_off00010121.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10121 18448 bytes
SHA-256: a84423a82683339cb7685097fb74ab20305946dfa710a537b58cacedf9be5f05