Malicious PDF — malware analysis report

Static analysis result for SHA-256 db0e4073d988db4c…

MALICIOUS

PDF

74.7 KB Created: 2021-09-20 16:06:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: a1cc805e473cb46f1f1c16608b2c5c83 SHA-1: 7d581ca7d07ceeba085b4ef30142b203fc6d91b3 SHA-256: db0e4073d988db4c6c94a0bebaf95a9379b81641e235095f18636bd1bdca101c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file is identified as malicious by ML classifiers and ClamAV, with multiple heuristics indicating it functions as a link farm or phishing lure. The embedded URLs, such as 'https://irlanc.ru/uplcv?utm_term=fifa+mobile+apk+21', are likely used to redirect users to malicious sites. Although no scripts were explicitly extracted, the PDF structure and numerous external links suggest an attempt to deliver a malicious payload or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://irlanc.ru/uplcv?utm_term=fifa+mobile+apk+21 PDF link annotation
    • http://vietsaovang.com/uploads/userfiles/file/vanaxanediliserawoneta.pdfIn PDF document text
    • http://stlnsk.ru/uploads/file/98005221927.pdfIn PDF document text
    • http://police8coop.com/UserFiles/file/20935139953.pdfIn PDF document text
    • http://bjerkelunden.org/content/files/userfiles/file///9389587841.pdfIn PDF document text
    • http://bsbcarpet.com/userfiles/file/10381648511.pdfIn PDF document text
    • https://kindeeyudee.com/ck_files/files/67499169971.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/p03drjiaa4pnci6ihdef1pn6su/jutinadep.pdfIn PDF document text
    • http://tid.vn/upload/files/gumofusumibe.pdfIn PDF document text
    • https://monyetjoget.com/contents/files/lidobupefufifum.pdfIn PDF document text
    • http://packamate.com/userfiles/98194209648.pdfIn PDF document text
    • http://realcomfort.ru/content/upload/file/woviduf.pdfIn PDF document text
    • http://ntvietnga.com/upload/files/tezedijumezujusa.pdfIn PDF document text
    • http://www.parkwaytransplant.com/media_upload/upload/files/wafesereselevukojikud.pdfIn PDF document text
    • https://shian-jin.com/UserFiles/files/jebuli.pdfIn PDF document text
    • https://artgallery.devctn.com/ckfinder/userfiles/files/pibepizakufagidam.pdfIn PDF document text
    • https://ptogel1.com/contents/files/puvaz.pdfIn PDF document text
    • http://zzzwchem.com/upload/files/kebukexerek.pdfIn PDF document text
    • http://baschin-heizung.de/meineBilderAlbertGrundschule/file/25877425233.pdfIn PDF document text
    • https://aayams.com/userfiles/file/fosajofigexidoz.pdfIn PDF document text
    • http://abwingsjanaf.com/uploads/files/51457227179.pdfIn PDF document text
    • https://paroles-vives.com/ckfinder/userfiles/files/10234196008.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ec6c57e476---wisosamuwotukoxobe.pdfIn PDF document text
    • http://thewhitmerlawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/57512061095.pdfIn PDF document text
    • http://h-n-s.net/userfiles/file/bebezuzuwake.pdfIn PDF document text
    • http://kanoonkaraj.ir/dbmanager/filebank/htmlgallery/file///78150363899.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_off0000b8da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8DA 20352 bytes
SHA-256: 65101752e68fb97c8635756dccc502c22729ff4da696208b6d5aaa63ac9effd3
font_01_sfnt_off0000edce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDCE 10428 bytes
SHA-256: f98b3a7a3f7c8ba0dfeff589da42c0d853317a6654857b1dc3e99080566a40e1
font_02_sfnt_off00010541.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10541 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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