Malicious PDF — malware analysis report

Static analysis result for SHA-256 aedb35fc633ec433…

MALICIOUS

PDF

74.5 KB Created: 2021-10-05 13:04:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 6667fa3bb65d35d08b943e780e9bc747 SHA-1: 17bb32518081187596d9564ced1ac587b8359c0c SHA-256: aedb35fc633ec433d519824d0350bf7f367aff5baa47fc99d201ea450a247e5a
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, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious sites, likely for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://irlanc.ru/uplcv?utm_term=10th+tamil+guide+james PDF link annotation
    • http://cukiernia-waltar.pl/qcms/userfiles/file/wewodumedi.pdfIn PDF document text
    • https://www.tvmreza.tv/ckfinder/userfiles/files/14599357026.pdfIn PDF document text
    • https://fullhousetourism.com/UploadFiles/file/20211002184458182.pdfIn PDF document text
    • https://openkomm.yussfone-crm.com/userfiles/file/94992295240.pdfIn PDF document text
    • http://lgassociates.in/uploads/33638674941.pdfIn PDF document text
    • https://timminsrenovations.ca/file/5Nk2NfIL4OCEodZG.pdfIn PDF document text
    • https://at2-turbo-j3t.com/contents/files/8033690947.pdfIn PDF document text
    • http://abbeytraining.net/userfiles/file/xitup.pdfIn PDF document text
    • http://andreuma.madteam.net/ckfinder/userfiles/files/kipabepi.pdfIn PDF document text
    • https://asiapharma.la/files/files/48308472299.pdfIn PDF document text
    • http://shsuorui.com/uploadfiles/fckeditor/20210923/file/16324146635071.pdfIn PDF document text
    • https://eprobatdz.com/ckfinder/userfiles/files/xubisigavagideruredanires.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141f94eac5ee---sefukerawo.pdfIn PDF document text
    • http://hcbarrett.com/user_area/file/46751165151.pdfIn PDF document text
    • http://ylplj.com/ckfinder/userfiles/files/vedadujokawivupe.pdfIn PDF document text
    • https://wolfgang-photography.com/userfiles/files/danifitibisop.pdfIn PDF document text
    • http://aeon-dev.com/uploads/files/202109210151497555.pdfIn PDF document text
    • http://angelojrobles.com/admin_initial_test/userfiles/file/94477272213.pdfIn PDF document text
    • http://nyitotthetvege.kastelyszallodak.hu/userfiles/files/bilebum.pdfIn PDF document text
    • https://a-pointpro.com/cms/ckfinder/userfiles/files/16730533046.pdfIn PDF document text
    • http://avvocatoandreabruschi.it/userfiles/files/96277451431.pdfIn PDF document text
    • http://sxhk365.com/uploads/file///5225777451.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_off0000bb22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB22 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d339.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD339 10680 bytes
SHA-256: 7aa28fc34a0f0d498d94ffeae197fe579d728ca9ff8d60342a03a0ebfc5b3966
font_02_sfnt_off0000eb7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB7B 18320 bytes
SHA-256: de48705b33352f9af48c7b9b6cb9fd1df4ee34e499de193865c64f8e2f2f1782