Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4760d202a36ca24…

MALICIOUS

PDF

68.7 KB Created: 2021-09-25 13:47:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 7dbe4ac5b2beb8e3f8ea9255c507d4e0 SHA-1: 93d571e6f9b1f4b18e912b81e68f73eb2142fe8b SHA-256: e4760d202a36ca2403df053d321080f51ed235dfc4431c7551155f4ca42d9fcd
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The presence of numerous embedded URLs, including one pointing to a link farm on disposable hosting, strongly suggests a phishing or malware distribution campaign. Although no scripts were explicitly extracted, the PDF structure and embedded links are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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 https://pixomot.ru/uplcv?utm_term=3+internet+settings+android PDF link annotation
    • http://sentai.cc/data/file/20210920_210537_540.pdfIn PDF document text
    • http://doktor-okonski.pl/uploadimg/file/muxajoninar.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/9c499e780b558f289ad620b1fd962348/97293189440.pdfIn PDF document text
    • http://phuketdriveschool.com/userfiles/file/62407932087.pdfIn PDF document text
    • https://nawaasha.org/userfiles/file/kujopopogamaragijitivuz.pdfIn PDF document text
    • http://opusbiz.kr/data/editor/file/2129666366612f6dc37a5cc.pdfIn PDF document text
    • http://meijialx.com/ckfinder/userfiles/files/94935327440.pdfIn PDF document text
    • https://www.drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16134afdb0cda3---vowod.pdfIn PDF document text
    • https://loppisidjupdalen.se/images/uploaded/file/58606113695.pdfIn PDF document text
    • https://jahanchart.ir/data/files/file/40445605918.pdfIn PDF document text
    • http://merwepizza.com/upload/file/27187897646.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/0c4dbebccabdce112cb871b3c9c009d4/31709307275.pdfIn PDF document text
    • http://qhzs88.com/admin/fckeditor_upfiles/file/2021091412032680554.pdfIn PDF document text
    • http://serbanindustrialconstruct.ro/uploads/files/livalimexekurobewutajara.pdfIn PDF document text
    • http://nrgmedia.hu/files/file/90179851117.pdfIn PDF document text
    • https://chambredhotes-savoie.com/ckfinder/userfiles/files/3029535465.pdfIn PDF document text
    • https://vientangluc.com/upload/files/fapunoduzutowasum.pdfIn PDF document text
    • http://cuspsurgeons.com/userfiles/file/sikekiwasoguwa.pdfIn PDF document text
    • http://wowbond.com/upload/Fckeditor/file/tajedifi.pdfIn PDF document text
    • http://mikomisushi.com/uploads/files/jasizuduvakarik.pdfIn PDF document text
    • http://indexone.ru/upload/file/najapezajibokefotofuv.pdfIn PDF document text
    • https://ijmscr.com/ckfinder/userfiles/files/wavaxamijixekezo.pdfIn PDF document text
    • http://mustang.tom.ru/jsplugins/ckfinder/userfiles/files/31293148530.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_off0000ad47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD47 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c559.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC559 15608 bytes
SHA-256: 4b952e877c8fb09626f9a2fc0e0f6f5a1044aab84f467ff9c5e50f3baff0720c
font_02_sfnt_off0000ecbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECBE 10452 bytes
SHA-256: 13e626134202d31961d9b7d03b47f04feabb77debcbfd35948c261fa0af1b3e5

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