Malicious PDF — malware analysis report

Static analysis result for SHA-256 f20188c218368f8b…

MALICIOUS

PDF

80.5 KB Created: 2021-09-10 20:55:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 292fe80fae2134f2fdb9c5e7844db8c8 SHA-1: f606772b833549ad7b0777f0bdb822a5bec223cd SHA-256: f20188c218368f8bacf3deeb68d58cdaf44e1e89d4355135c3a6d5d5abfab16f
126 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs and is identified as a link farm on disposable hosting, suggesting it's designed to redirect users to potentially harmful sites. The presence of embedded URLs and the PDF structure itself point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://tjsijiqing.com/ckfinder/userfiles/files/2021/0911/c473c9165ac5f4905107b89b5f62763f.pdf In PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a38113460e---44679487375.pdfIn PDF document text
    • https://confetti-seasons.ru/upload/files/gototajipumimepoviminox.pdfIn PDF document text
    • https://soi.icami.mx/ckfinder/userfiles/files/27115006575.pdfIn PDF document text
    • http://retailpark.bg/uploads/wysiwyg/files/94145396135.pdfIn PDF document text
    • http://www.jokilaaksonratsastajat.fi/file/9133780492.pdfIn PDF document text
    • https://cambodiadriverservice.com/userfiles/file/11464724553.pdfIn PDF document text
    • http://sns.hu/_user/file/sujuzaju.pdfIn PDF document text
    • http://hophungvietnam.com/app/webroot/uploads/files/tukujajetivowejopew.pdfIn PDF document text
    • https://mondoaudio.it/img/uploaded/file/79376665586.pdfIn PDF document text
    • http://tygodnikzuzlowy.pl/ckfinder/userfiles/files/tebamadoveroloxusizuz.pdfIn PDF document text
    • http://langmypham.com/luutru/files/jifozibowejez.pdfIn PDF document text
    • http://biolabsrl.org/userfiles/files/4332902599.pdfIn PDF document text
    • http://another-partner.morefriendship.com/upload/files/68475209195.pdfIn PDF document text
    • http://workcoop.org/fckeditor/userimages/file/20210904130459.pdfIn PDF document text
    • https://qfuse.it/images/uploaded_files/ckfinder/files/1630618212_ce60ddafc5.pdfIn PDF document text
    • http://instalater-macecek.cz/klienti/devel/sneznerolby.cz/ckfinder/userfiles/files/28835633479.pdfIn PDF document text
    • https://movimientofamiliadejesus.com/images/uploaded/file/viziwizitelit.pdfIn PDF document text
    • http://www.thunderesp.com/ckfinder/ckfinder.htmlfiles/8841677452.pdfIn PDF document text
    • http://haciogullari.com/depo/sayfaresim/file/65115822663.pdfIn PDF document text
    • http://9275522-travel.com/userfiles/file/bamadurabogikudatemir.pdfIn PDF document text
    • http://dailythang.com/userfiles/files/rikorozezativ.pdfIn PDF document text
    • https://pasifikendustriyel.com/userfiles/file/16184252514.pdfIn PDF document text
    • http://borneneskontor-landsforening.dk/userfiles/file/jisokujupumo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=miss+peregrine%27s+home+pdfPDF 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_off0000d3e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3E4 10668 bytes
SHA-256: 1e5b28f1a0644f747842e902ebedf8e34d9ee93242d885854be5f1307bbf31dd
font_01_sfnt_off0000ebe3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBE3 18612 bytes
SHA-256: dc5c92ee136a30cad318acdcc98cd65639bec354905feee84f2a353f0dd64495
font_02_sfnt_off00011c4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C4D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1