Malicious PDF — malware analysis report

Static analysis result for SHA-256 38b6e20d63d400de…

MALICIOUS

PDF

72.7 KB Created: 2021-09-20 17:37:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 0790ebf608208b533636f4f9a17cc2a3 SHA-1: 5e0b4fa1509cc883ea1dbc9a9e4440e356691d53 SHA-256: 38b6e20d63d400de59608becab11cbdc6439acc243688e956cc745e78b5b9367
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a heuristic firing indicates it is a link farm, with numerous external URIs pointing to potentially malicious or phishing sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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.
  • 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://pixomot.ru/uplcv?utm_term=mighty+knight+unblocked PDF link annotation
    • http://radecznica.pl/userfiles/file/28887298616.pdfIn PDF document text
    • http://paroissedementon.fr/upload/files/73625439833.pdfIn PDF document text
    • https://hfbee.tw/upload/ckfinder_temp/files/20210910200137.pdfIn PDF document text
    • https://snapstudios.ca/userfiles/file/tigeweji.pdfIn PDF document text
    • https://muahohangnhat.com/app/webroot/uploads/files/43045154499.pdfIn PDF document text
    • http://sangtaoad.com/uploads/userfiles/file/xigegogo.pdfIn PDF document text
    • https://www.assofmt.org/ckfinder/userfiles/files/15529413188.pdfIn PDF document text
    • https://patriciogaete.com/upload/file/puwoxunaruvaxozapamaw.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/o5ogbifsmrfmqcd4dappg7q631/dowuzejuwevugepazivijumi.pdfIn PDF document text
    • http://tanriovermensucat.com/uploads/genel/files/78662985334.pdfIn PDF document text
    • https://wfca-czech.cz/temp/userfiles/files/kamofu.pdfIn PDF document text
    • http://seoulsquare.com/userfiles/file/73079358115.pdfIn PDF document text
    • https://prestinieurope.ch/userfiles/files/juzokuzutuwo.pdfIn PDF document text
    • https://bak.vn/upload/files/rotumosejololuladafaw.pdfIn PDF document text
    • https://underworldgear.com/upload/users/files/kimebitabiteseru.pdfIn PDF document text
    • http://itexpertdog.nwoasis.com/upload/files/pixuzadexedujelojopi.pdfIn PDF document text
    • http://dachastyle.com/userfiles/file/zerogejil.pdfIn PDF document text
    • https://sapporomn.com/userfiles/files/32648104278.pdfIn PDF document text
    • https://trade.inter-ural.ru/ckfinder/userfiles/files/1393389173.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/161412421e207b---nurodedonisugewowugonavi.pdfIn PDF document text
    • http://garage-ys.info/js/upload/files/94248083216.pdfIn PDF document text
    • http://ge-mak.com/files/kepajatome.pdfIn PDF document text
    • http://yucehukuk.com/resimler/files/23558754547.pdfIn PDF document text
    • https://dcimx.com/files/xejulabubagebegavodeja.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_off0000b8f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8F9 10656 bytes
SHA-256: a89f3dfa2c949856a0fd007f6ac567c0d29f6ae2dabbccec8563281082446a74
font_01_sfnt_off0000d11e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD11E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e930.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE930 17076 bytes
SHA-256: 1d6c12f9e12d1787719d75ba4dcb65659901f110adafd6aa6f5d72df8be51929

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