Malicious PDF — malware analysis report

Static analysis result for SHA-256 8554cb7c8942cddb…

MALICIOUS

PDF

73.3 KB Created: 2021-09-17 19:06:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 21042276955eb6d3281e7527801dad9a SHA-1: e6fad9125006224efb70e528efd0cd13235ec904 SHA-256: 8554cb7c8942cddba6717cfbe71ceca530ad9bac730db5060208c7812c4ee83d
126 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, with high confidence. Heuristics indicate it functions as a link farm, containing numerous links to external sites, one of which is hosted on disposable infrastructure. The embedded URLs suggest an attempt to direct users to potentially malicious or phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 http://skipjackpoke.com/ckfinder/userfiles/files/nubewapazivebixixobiwa.pdf In PDF document text
    • https://amursvoidom.ru/media/files/34543876274.pdfIn PDF document text
    • https://emtracing.net/userfiles/file/7237511510.pdfIn PDF document text
    • http://lechioutdoor.com/userfiles/file/14452134285.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613c2fee47a7d---94982501046.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/161449778d0314---dixorowarilovuli.pdfIn PDF document text
    • https://nabijdefossa.nl/upload/files/27974468913.pdfIn PDF document text
    • http://www.offshoreyachts.net/web_upload/editor/files/15436292313.pdfIn PDF document text
    • http://agisinfo.ru/uploads/content/files/66941350380.pdfIn PDF document text
    • https://rendszergazda-cegeknek.hu/ckfinder/userfiles/files/56420669019.pdfIn PDF document text
    • https://360clothing.indicsys.com/home/www360cl/public_html/uploads/images/files/dodesapesedujokofun.pdfIn PDF document text
    • http://loadcell.vn/Images_upload/files/68096957055.pdfIn PDF document text
    • http://www.shjkyq.com/up_files/FCK/file/77922161922.pdfIn PDF document text
    • https://joinvita.com/neu/userfiles/file/95025505549.pdfIn PDF document text
    • https://designmaster.in/scgtest/eec-new/codelibrary/ckeditor/ckfinder/userfiles/files/30528559445.pdfIn PDF document text
    • http://contua.org/userfiles/file/57518202657.pdfIn PDF document text
    • http://handgun.ee/media/file/76828710321.pdfIn PDF document text
    • https://ceylanotel.com/firma/files/974874288.pdfIn PDF document text
    • https://snoman.mb.ca/ckfinder/userfiles/files/jujudunegafuzexamefowo.pdfIn PDF document text
    • http://kyochonbuenapark.iorderfoods.com/uploads/files/simonojaliponokadarono.pdfIn PDF document text
    • http://optykglowacki.pl/obrazki/files/8986612934.pdfIn PDF document text
    • https://cplastik.com/data/cms/file/vozolozaxisipolewokugixis.pdfIn PDF document text
    • https://anitacalderon.com/ckfinder/userfiles/files/92809609268.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=the+real+housewives+of+beverly+hills+putlockerPDF 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_off0000bbf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBF2 16256 bytes
SHA-256: bf10428e492227afd1f247da54132d56297c68c7b0d20548b79d48bc4f2f2b59
font_01_sfnt_off0000e5d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5D4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fdeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDEB 11032 bytes
SHA-256: 006f59a84d4c78832ec0a9173065416bf8b86871e6f26ea84bfec9eb3da2f7d4