Malicious PDF — malware analysis report

Static analysis result for SHA-256 3bf2c053dcc518cd…

MALICIOUS

PDF

79.9 KB Created: 2021-09-20 16:30:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 9fa0588a262904db09deab411af6213b SHA-1: 73a221cbb13651b37c53953056618bb1aaca9df0 SHA-256: 3bf2c053dcc518cd3f5528939b2b2b9935314e8600e2da6fb924267655b70f2a
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs and is flagged by ClamAV as 'Pdf.Phishing.Trojan'. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a high volume of links on disposable hosting, suggesting an attempt to redirect users to malicious sites. While no scripts were explicitly extracted, the nature of the PDF and its numerous links strongly suggests it's part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 6

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://truckforceone.com/upload/editor/file/26886654949.pdf In PDF document text
    • http://slbreakingnews.com/ckfinder/userfiles/files/80136314081.pdfIn PDF document text
    • http://agro-vostok.ru/userfiles/file/26676371890.pdfIn PDF document text
    • http://hydrem.ru/images/file/gujoxexamezovidomojobomiz.pdfIn PDF document text
    • http://fullx.net/files/runet.pdfIn PDF document text
    • https://mfdesign.hu/files/file/16659857319.pdfIn PDF document text
    • https://insolite.lu/img/userfiles/files/8862794048.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/161434546db5d5---mubewejabefik.pdfIn PDF document text
    • https://seger.cz/userfiles/file/lojufaveg.pdfIn PDF document text
    • https://jasz-pap.hu/UserFiles/file/88841634913.pdfIn PDF document text
    • http://karinameal.ru/imgdish/files/kozefibowifarud.pdfIn PDF document text
    • https://igk-lilienthal.de/downloads/wikuwanuvek.pdfIn PDF document text
    • http://synphabase.ch/upload/file/72341601585.pdfIn PDF document text
    • http://traslochimontalto.it/userfiles/files/33775417562.pdfIn PDF document text
    • http://cheevalome.com/image/upload/File/xipegorufokitokoxel.pdfIn PDF document text
    • http://zeguvietnam.com/uploads/ckfinder/files/jubalelizof.pdfIn PDF document text
    • http://touristclub.in/userfiles/file/42425793587.pdfIn PDF document text
    • http://chiaranannini.com/userfiles/files/lavarojobaleladexavulakor.pdfIn PDF document text
    • https://afayl.com/userfiles/file/3768094403.pdfIn PDF document text
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/16132381a4b8f8---44906225001.pdfIn PDF document text
    • https://szelvedojavitasmiskolc.hu/files/files/58881875177.pdfIn PDF document text
    • http://ozt.zielonetarasy-cieplice.pl/uploads/userfiles/files/95506369403.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=dead+rivals+mmoPDF 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_off0000d60f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD60F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE21 17236 bytes
SHA-256: fe18f309c1a762edc5a3013e7d513f8197c12a55eb2c61be4044e940e7034965
font_02_sfnt_off00011b93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B93 10272 bytes
SHA-256: 8a0bc662d19e16d955167c8ca94705be86854f8b01109a225d4fc0636a51ec11

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