Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a8d095eec6f6ec7…

MALICIOUS

PDF

72.8 KB Created: 2021-09-27 11:09:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f849f90e1e6a93d631915521fc3a5566 SHA-1: a834bb5829bb5eb80386d46958081a3c71e62d3d SHA-256: 4a8d095eec6f6ec77896174d3628b99a74a458888c8ee5892c5ace500a9c70e1
134 Risk Score

Malware Insights

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

The sample was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities or redirecting users. The numerous external URLs, many hosted on disposable domains, suggest a link farm or phishing campaign designed to distribute further payloads or collect user credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://queure.ru/uplcv?utm_term=unwritten+rules+book+pdf PDF link annotation
    • http://palmdale.thepokeluau.com/uploads/files/gebuladukutexiwegezar.pdfIn PDF document text
    • https://nevjegyzek.eu/uploads/file/77201438498.pdfIn PDF document text
    • http://dulichtantai.com/files/uploaded/files/rodilo.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/de3cb4d11d60caff74b8312b1b2a73af/92245345938.pdfIn PDF document text
    • http://ch-bovi.com/upload/files/kisajunesezewinebenasa.pdfIn PDF document text
    • http://monikaknoblochova.com/userfiles/file/3829179403.pdfIn PDF document text
    • https://cupanghitam.com/contents/files/88176337964.pdfIn PDF document text
    • http://dr-onesrl.com/userfiles/files/gagagi.pdfIn PDF document text
    • https://manusingh.org/scgtest/eec-new/codelibrary/ckeditor/ckfinder/userfiles/files/75377330301.pdfIn PDF document text
    • http://epoptavky.com/is/images/FCKeditor/File/nolekigu.pdfIn PDF document text
    • https://coherence.cz/userfiles/file/51278906.pdfIn PDF document text
    • https://knurussian.kr/DATA/upload/files/202109240038235801.pdfIn PDF document text
    • http://palaciodelosnavas.com/userfiles/file/jikotojorudixitavegi.pdfIn PDF document text
    • https://franciscojaviermoreno.com/DocsCKeditor/files/14857053722.pdfIn PDF document text
    • http://canvangdientu.com/images/file/fakisenifujo.pdfIn PDF document text
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/eb56822221425116662aed68a5eb57c1/92543430302.pdfIn PDF document text
    • http://izmirtavla.com/upload/file/wupukibidilivefepi.pdfIn PDF document text
    • http://park-seversk.ru/other/js/ckfinder/userfiles/files/3809145264.pdfIn PDF document text
    • http://zhouzhuanx.com/v15/Upload/file/2021918237427356.pdfIn PDF document text
    • https://www.lucaslobker.com/minor/ckfinder/userfiles/files/64499094198.pdfIn PDF document text
    • http://website-design-company.in/dev3/damodar/ckfinder/core/connector/php/userfiles/files/wabajuludipa.pdfIn PDF document text
    • https://www.iieng.org/editor/ckfinder/userfiles/files/45751959270.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_off0000b5dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5DC 10756 bytes
SHA-256: 29ae5a770d7d7e4be1a68613adb305e83e7ba247c609cd0fea828aa72033b057
font_01_sfnt_off0000ce91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE91 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e6a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6A3 18368 bytes
SHA-256: 0b7d8b73e6eef7ddaa1013b50be16137a74ea7c5dddf7a233fed0f629ccb79f7

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