Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc7f1c999440cc05…

MALICIOUS

PDF

67.8 KB Created: 2021-09-12 21:23:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: d95a5b3267d8486bf5075058e0c5e940 SHA-1: 0d5c73e57e36765122c959da38bdf050e93d6cb7 SHA-256: fc7f1c999440cc05a0049bee89b54e962800943d6001262fe3424625ca5fe954
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains embedded JavaScript and is identified as a phishing lure. It utilizes an image-only interface, a common tactic to disguise malicious links. The document redirects to external URLs hosted on disposable domains, suggesting an attempt to distribute malware or phish for credentials. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 67 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://queure.ru/uplcv?utm_term=fun+things+to+do+minecraft PDF link annotation
    • http://93564497.com/userfiles/80133880379.pdfIn PDF document text
    • http://solar-makernavi.com/ckfinder/userfiles/files/41729031356.pdfIn PDF document text
    • http://hnkingdee.cn/Files/file/20219564258.pdfIn PDF document text
    • https://ebal.ro/app/webroot/files/userfiles/files/porabavuwukoro.pdfIn PDF document text
    • http://dagmar-e.de/userfiles/file/17091735229.pdfIn PDF document text
    • http://spodne-pradlo-2bpoint.sk/UserFiles/File/xerujolona.pdfIn PDF document text
    • http://njuhome.pl/ckfinder/userfiles/files/80200783009.pdfIn PDF document text
    • https://bluza-shop.ru/content/File/bemadowunexof.pdfIn PDF document text
    • https://satnamunicipalcorporation.com/admin/ckfinder/userfiles/files/88956197598.pdfIn PDF document text
    • http://crm333.com/documentos/file/76105189406.pdfIn PDF document text
    • http://valencia.thepokeluau.com/uploads/files/xazamutivale.pdfIn PDF document text
    • https://molecult.metallo-tests.ch/sites/web/upload/files/12729029948.pdfIn PDF document text
    • http://taxilitomerice.cz/ckfinder/userfiles/files/7286997552.pdfIn PDF document text
    • http://wskinbody.com/data/boardData/files/nipubasaxonoxikekix.pdfIn PDF document text
    • http://m-styleauto.com/js/upload/files/8074970448.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613bf070bced4---jatibolulupexowivajifuxu.pdfIn PDF document text
    • https://nhanloc.net/userfiles/file/41637317386.pdfIn PDF document text
    • https://ises.smithpressautomation.com/phpsites/vertical_living/uploads/file/98895083369.pdfIn PDF document text
    • https://suacuacuontoanphat.com/upload/files/ragorafekerapasuri.pdfIn PDF document text
    • https://villatoscana-pi.it/userfiles/file/silinal.pdfIn PDF document text
    • https://irish-setter-zucht.info/ckfinder/userfiles/files/julodupewuregif.pdfIn PDF document text
    • https://rsebolivia.org/userfiles/file/26613723940.pdfIn PDF document text
    • http://gorsilawfirm.com/userfiles/file/51913800837.pdfIn PDF document text
    • http://baove24h.org/upload/files/mifunisevowipifigibuvabuz.pdfIn PDF document text
    • https://art-lamps-rali.eu/files/file/jufupivibufofajufisaji.pdfIn PDF document text
    • 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_off0000af97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF97 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c7ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7AE 10956 bytes
SHA-256: abfbfe88d2f2140fc431f2c78195f7a572978b61adaed71bf2ae66e0ed6e59d5
font_02_sfnt_off0000e0a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0A3 13520 bytes
SHA-256: 822e7c55b66b95a2f849849fc5d1308c7151e8c57ac23c2c82e13bf5de329707