Malicious PDF — malware analysis report

Static analysis result for SHA-256 6fb8213f649479b7…

MALICIOUS

PDF

92.7 KB Created: 2021-09-11 12:44:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: a0fee953d527e212ecfedfdc6c37fd62 SHA-1: 11eae56ac7b82cea04a373c97141cf1fa1952a99 SHA-256: 6fb8213f649479b74f8dd22c154292b3c577f8779c4361636a4f85b55d1908cc
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous embedded URLs pointing to potentially malicious content. While no scripts were explicitly extracted, the PDF structure and link farm behavior suggest an attempt to redirect users to malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://jpsacademy.com/slbdavbatala/userfiles/file/70474559003.pdf In PDF document text
    • http://sibstroiexp.ru/userfiles/file/4043732170.pdfIn PDF document text
    • http://www.reeder.ee/files/filemanager/51845326854.pdfIn PDF document text
    • https://sausalito.com/wysiwygfiles/file/7580444681.pdfIn PDF document text
    • http://cobansut.com/userfiles/file/12366569920.pdfIn PDF document text
    • http://sm.ac.th/ckfinder/userfiles/files/13732645661.pdfIn PDF document text
    • http://rgn2u.com/userfiles/files/18810803112.pdfIn PDF document text
    • https://cepatdaftargroup2.com/contents/files/vivojin.pdfIn PDF document text
    • https://spheresignal.com/app/webroot/userfiles/files/81502254807.pdfIn PDF document text
    • https://pastelbuilders.com/userfiles/file/39470134390.pdfIn PDF document text
    • http://bellamy.tw/uploads/files/202109051853259572.pdfIn PDF document text
    • https://laetitiabernard.fr/images/file/gamivavovoti.pdfIn PDF document text
    • http://maxbrio.kr/files/files/xutuw.pdfIn PDF document text
    • http://burmeseburmilla-allevamento.com/userfiles/files/27129625384.pdfIn PDF document text
    • https://vettercycles.ch/userfiles/files/51450722162.pdfIn PDF document text
    • http://kredoteka.ru/uploads/file/gemija.pdfIn PDF document text
    • http://stonebreaker.at/sozedutudeke.pdfIn PDF document text
    • https://przygodanaukrainie.pl/admin/ckfinder/userfiles/files/20300405587.pdfIn PDF document text
    • http://mn-print.ru/ckfinder/userfiles/files/zimifofeki.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134fe15d48b1---22308734721.pdfIn PDF document text
    • http://himalayakebab.irafbrothers.com/shipinc/userfiles/files/92044961010.pdfIn PDF document text
    • http://music-saikung.com/ckfinder/userfiles/files/97345797210.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=apk+sports+live+tvPDF 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_off00010810.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10810 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012022.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12022 17864 bytes
SHA-256: 16047f58f7965c2217471a13fc006536abf1bc36f1e7e6f32dc15f515bbe40dd
font_02_sfnt_off00014edc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14EDC 10116 bytes
SHA-256: ad1c4bfc11cc81281a00a18801e7ef3a1cfb46f2a265a952e444580c5c226c74

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