Malicious PDF — malware analysis report

Static analysis result for SHA-256 a824eca4ac4a5dbc…

MALICIOUS

PDF

74.6 KB Created: 2021-09-15 19:07:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 5978dbdf86a5d99c4d8edaceec635635 SHA-1: ac6412d2751698ee48d9cf11aeb1c3e737ac00ad SHA-256: a824eca4ac4a5dbc18d3f56cbaec5a5ada3cbbced9a69438649371593298d909
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, embedding numerous external URIs, many of which point to unknown or potentially malicious domains. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect users to malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161314e5744259---51379256797.pdf In PDF document text
    • http://only-svet.ru/upload/files/jijuruzagaroj.pdfIn PDF document text
    • https://www.sophrologue-nimes.fr/upload/news/files/67944358984.pdfIn PDF document text
    • https://www.frontieregypt.com/sites/all/libraries/ckfinder/userfiles/files/16901815923.pdfIn PDF document text
    • https://media-get.com/userfiles/files/luvutusilopafupete.pdfIn PDF document text
    • http://brandnewgoods.net/userfiles/file/79888219155.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/pn6pctocbql5gspq6e4lleufbc/sezonomodukepipagoru.pdfIn PDF document text
    • http://www.gc-antey.ru/ckfinder/userfiles/files/jitagepene.pdfIn PDF document text
    • http://tsradviseurs.nl/mailing/images/photo/file/wisorawe.pdfIn PDF document text
    • http://budaikepkeret.hu/uploads/file/14876064051.pdfIn PDF document text
    • http://ned.ru/uploads/files/vukupanarekas.pdfIn PDF document text
    • http://albino-pitti.com/pub_img/file/40999070393.pdfIn PDF document text
    • http://kevinmcallisterlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/59086545671.pdfIn PDF document text
    • http://xy-interior.com/uploads/files/202109090950395684.pdfIn PDF document text
    • https://santehsevast.ru/userfiles/files/22573412566.pdfIn PDF document text
    • https://sunpower.lv/ckfinder/userfiles/files/30783079462.pdfIn PDF document text
    • http://aeusjtu.pretty-match.com/upload/files/ganev.pdfIn PDF document text
    • http://tw-sincere.com/upfiles/editor/files/fanakajesixibevojozep.pdfIn PDF document text
    • http://joesservicecenternj.com/userfiles/files/53097153286.pdfIn PDF document text
    • http://vit-physio.de/file/vurizerimovip.pdfIn PDF document text
    • http://skkl.cn/filespath/files/20210914180211.pdfIn PDF document text
    • http://sage-chem.com/image/files/20210902_002247.pdfIn PDF document text
    • https://medbioplast.com/klucharnet/images/file/13936792283.pdfIn PDF document text
    • https://wic-net.com/userfiles/file/69570329615.pdfIn PDF document text
    • https://cowichanmusicfestival.com/userfiles/file/ruwijavefowaruwisexepugov.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=oh+say+can+you+seed+dr+seuss+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_off0000bff2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFF2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d804.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD804 17292 bytes
SHA-256: 7d965ea06622738b2c18d4d239fd4e0f94d1e56360a48ac762389a73cacae74d
font_02_sfnt_off00010442.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10442 10720 bytes
SHA-256: 13df786ca0084aac098e879fbc329bc2d0c4cb5d8ace38407076abdf0c6fa997