Malicious PDF — malware analysis report

Static analysis result for SHA-256 da97faf9ccbd2e38…

MALICIOUS

PDF

75.8 KB Created: 2021-09-23 14:36:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 469ea895acf159a35a22aa4cdc2b8a37 SHA-1: cb1ffa75484e809c05ce75def73c3e06ee477ab9 SHA-256: da97faf9ccbd2e38db70d6751abf97f6362005189e6355cc4e2b2f4d1dd2d5db
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a link farm detection and a machine learning classifier, indicating malicious intent. The presence of numerous embedded URLs, many pointing to disposable domains, suggests a phishing or malware distribution campaign. Although no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9962

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://travelspace.pl/userfiles/file/surekesutavasefejezi.pdf In PDF document text
    • http://pzhjintai.com/upload/files/61463510846.pdfIn PDF document text
    • https://piti.leaddeehub.com/userfiles/files/wefuzuvajerujobalefamez.pdfIn PDF document text
    • http://happyhanool.com/ckupload/files/manureboza.pdfIn PDF document text
    • https://chupwo.com/editor_upload/file/datef.pdfIn PDF document text
    • http://smolninskayahotel.com/userfiles/file/dedurexatofavewovabogo.pdfIn PDF document text
    • https://kolegium.inaheart.org/upload/files/10911878438.pdfIn PDF document text
    • http://mxm-hosting.nl/img/editor/file/71811773774.pdfIn PDF document text
    • http://xatrbio.com/userfiles/file/rilufowaxina.pdfIn PDF document text
    • http://xn--or3bi2da319p.com/upload/fckeditor/file/57493682603.pdfIn PDF document text
    • http://klawiatury-foliowe.pl/_data/file/37951788180.pdfIn PDF document text
    • http://mashhadgardi724.ir/basefile/mashhadgardi724/files/22031539805.pdfIn PDF document text
    • http://fioredda.com/userfiles/files/48794427302.pdfIn PDF document text
    • https://pacantioquia.org/aym_image/files/sipubev.pdfIn PDF document text
    • http://hieuchuan.com/upload/files/rufavesofoxi.pdfIn PDF document text
    • https://locktactyuma.com/ckfinder/userfiles/files/89278196860.pdfIn PDF document text
    • https://onhimalayas.com/ckfinder/userfiles/files/nolaxexivu.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/161445ec61c0cd---84190888715.pdfIn PDF document text
    • http://marklaliberte.com/fckupload/file/jizuvaxogorodilove.pdfIn PDF document text
    • http://johndanton.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vapuxubuxiwonuzifopa.pdfIn PDF document text
    • http://ebiocell.com/uploadfile/file///2021091813114483.pdfIn PDF document text
    • https://phoenixturkey.com/upload/ckfinder/files/torokinizujomuvif.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=droid+webcam+proPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b131.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB131 17276 bytes
SHA-256: 1c9e1badcd4df07cb38e429f3deb71ead1e9600dff385c80fc4a586ccdae5810
font_01_sfnt_off0000dc0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC0C 10488 bytes
SHA-256: aa676d93dad90c3aebcf0a3e617e63334b3f2f7d8da477ac7ed9b9d6012caf93
font_02_sfnt_off0000f3b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3B3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00010bc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BC4 16132 bytes
SHA-256: da3599785d691edba6bb1dc804d5dbf9cdb050cf7bdfa967d514dff539c0bfb6

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