Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1aa2f9b7619dfc4…

MALICIOUS

PDF

69.7 KB Created: 2021-09-27 22:23:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: a3a298968323405048d8b93db404fce8 SHA-1: 891c4919ae64ca30d459a044c1f38200981854f7 SHA-256: a1aa2f9b7619dfc478ab0e635576f5c9330c024e3ce175a7df0a4fd351ea93aa
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one specifically pointing to a suspicious domain ('allytemp.ru') that is likely used for phishing or malware distribution. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a large number of links on disposable hosting, further supporting a malicious intent. ClamAV also detected this file as 'Pdf.Phishing.Trojan'.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://allytemp.ru/uplcv?utm_term=tevar+movie+watch+online PDF link annotation
    • https://www.sistemkabin.com/ckfinder/userfiles/files/sidon.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/aat5h2ur2j23dla11tm6egeht0/jelopejumu.pdfIn PDF document text
    • https://clarkfamilybuilders.com/home/clark/public_html/ckfinder/userfiles/files/tutoparam.pdfIn PDF document text
    • http://ride-on-earth.com/images/blog/file/28317594194.pdfIn PDF document text
    • https://tradingphrases.net/userfiles/files/logodonokuxezonetaketo.pdfIn PDF document text
    • http://ryyw.com/upload/files/2021/09/202109052246525650.pdfIn PDF document text
    • http://praguynakorn.com/praguynakorn/picture/datapro/files/29845316758.pdfIn PDF document text
    • http://vlajkylevne.cz/UserFiles/File/91063753760.pdfIn PDF document text
    • https://strings97.hu/userfiles/file/96613158208.pdfIn PDF document text
    • http://posicert.com/upload_fck/file/2021-9-4/20210904025324895385.pdfIn PDF document text
    • https://highfieldhousehotel.net/nbloom/fckuploads/file/40994070294.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613407353d3ef---18524848759.pdfIn PDF document text
    • http://laulumaja.fi/ckfinder/userfiles/files/85771904562.pdfIn PDF document text
    • http://www.mostenpo.jp/userfiles/files/dipaxisutum.pdfIn PDF document text
    • http://king-tableware.com/uploads/files/202109251205254335.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/3913c24c3b885b7457801306da68bd26/tuvobugerixumukadoropiw.pdfIn PDF document text
    • http://starfishdowney.com/uploads/files/nugobonugefux.pdfIn PDF document text
    • http://bluebirdcanada.com/FileData/ckfinder/files/20210911_20358DA9EA11C218.pdfIn PDF document text
    • https://linker.tw/files/liwawilutagevi.pdfIn PDF document text
    • http://danchrisjewelry.com/userfiles/file/xuwukuriwewixanajurofef.pdfIn PDF document text
    • https://willes-gb.com/uploads/files/202109010850267205.pdfIn PDF document text
    • http://wellnesszeewolde.nl/site/data/ws/files/pabuxafob.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_off0000b1a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1A0 16448 bytes
SHA-256: d20c8f105c83b8a07930f83ff9208e33f72666523a70d4a6f856b894f87d7f97
font_01_sfnt_off0000d949.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD949 10444 bytes
SHA-256: 3acc6c720120873ef471f074557ccee3c2e609e76b3af4977f3377db729ea7b5
font_02_sfnt_off0000f0d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0D4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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