Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7e7efb5c3d3d797…

MALICIOUS

PDF

100.0 KB Created: 2021-09-14 09:00:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-24
MD5: 53c5cab8e7c6943f764a77f8679d56ee SHA-1: 8199940d59ce30540bda84ab87a9d375af5e5bdf SHA-256: a7e7efb5c3d3d797f8170f88a528951d6b5b2d37d7754d4134276c2668af7352
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://ptkas.com/kingkong/userfiles/files/tetef.pdf In PDF document text
    • http://jyjjapan.jp/files/ckeditor/files/48915319315.pdfIn PDF document text
    • https://www.wsbe17hongkong.hk/_bin/ckfinder/userfiles/files/18163421744.pdfIn PDF document text
    • http://streetnn.ru/data/upload/ck/files/tinemarerofomeg.pdfIn PDF document text
    • http://rongqichem.com/upload/files/kalakatigowajoxuwe.pdfIn PDF document text
    • http://shiny-baby.com/fileimage/file/lisikelatipulikopo.pdfIn PDF document text
    • http://byecook.com/ckupload/files/zalisigefo.pdfIn PDF document text
    • https://gemicilojistik.com/userfiles/upload/file/7850338536.pdfIn PDF document text
    • https://penal-garazh.ru/files/kaxozamuxogemetonerilok.pdfIn PDF document text
    • http://showdoimovel.com/files/files/kuxojupen.pdfIn PDF document text
    • http://kondicionery-lobnya.ru/upload_picture/file/10290611442.pdfIn PDF document text
    • http://drivingschool-brno.eu/files/34775704259.pdfIn PDF document text
    • https://meritumptt.pl/dokumenty/file/pudozosage.pdfIn PDF document text
    • http://mixline.ru/img/lib/file/bivetofaz.pdfIn PDF document text
    • http://ingpiazza.eu/userfiles/files/sezagelam.pdfIn PDF document text
    • https://stijsr.com/userfiles/file/nepexi.pdfIn PDF document text
    • http://xn--3e0b556bhrbowi6undva.com/ckupload/files/7586356132.pdfIn PDF document text
    • https://eminencesolutions.in/resources/userfiles/file/xozalefesojezajuzuradosup.pdfIn PDF document text
    • http://nbkhjc.com/uploads/202109/file/210902050737041762hozuddcstkj3.pdfIn PDF document text
    • http://emailreceptionist.net/userfiles/file/20921485458.pdfIn PDF document text
    • http://suliaok.com/v15/Upload/file/20219537327707.pdfIn PDF document text
    • http://karinameal.com/imgdish/files/dusisotunasixisorijuja.pdfIn PDF document text
    • http://dabaizhongxue.com/upload_fck/file/2021-9-7/20210907164612473831.pdfIn PDF document text
    • http://www.leposeur.fr/site/upload/ckfinder/files/42524335112.pdfIn PDF document text
    • http://cofetariafraguta.ro/UserFiles/file/94381632059.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=android+emulator+how+to+install+apkPDF 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_off00012095.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12095 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000138ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138AC 10916 bytes
SHA-256: 11b28937e90928eab91a6c9f784191c8727f25a5429901c4b48757b21e9a39f3
font_02_sfnt_off000151ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x151CE 18412 bytes
SHA-256: 7eab99e169aef320a429daa1f1322a96be6865bc8cc2eeb120e407e3d5eb369e

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