Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8939b6399bc0f09…

MALICIOUS

PDF

73.8 KB Created: 2021-09-26 18:01:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 8f82e1d29c19ecf17e023669a574d091 SHA-1: b2b99fe3ef9e9f903fcddf0eb953cb6a40b6868e SHA-256: e8939b6399bc0f0914b0c1307843405127eb54a48d16cd866a1f9966f780b2ee
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of numerous external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic suggest the document is designed to redirect users to potentially harmful websites. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://catamma.ru/uplcv?utm_term=how+to+combine+2+photos+on+android PDF link annotation
    • http://texinpack.com/uploadfile/file///2021091921555619.pdfIn PDF document text
    • https://designclarf.it/file/velanuwexisowodef.pdfIn PDF document text
    • http://gojjang.com/uploads/files/68284711492.pdfIn PDF document text
    • http://resortcrimea.com/ckfinder/userfiles/files/42779004110.pdfIn PDF document text
    • http://amicalelaique-guyancourt.fr/ckfinder/userfiles/files/kewazivagonad.pdfIn PDF document text
    • http://indel.sk/userfiles/file/sirel.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140e1f8ef1c8---sejonumagesozixukimup.pdfIn PDF document text
    • http://radyoislam.com/resimler/files/68107601958.pdfIn PDF document text
    • http://hzbmsj.net/images/upload/File/mituvazasiluxinipaxa.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613aa7d719cc2---96069682072.pdfIn PDF document text
    • http://rothemtour.com/FileData/ckfinder/files/20210917_0712ABC94F8E559F.pdfIn PDF document text
    • https://financenetwork1.treasuryandfinance.info/userfiles/file/97187662296.pdfIn PDF document text
    • https://fleschimmo.lu/userfiles/files/42026822932.pdfIn PDF document text
    • https://saikekanglun.com/filespath/files/20210922023252.pdfIn PDF document text
    • https://pezenasenchantee.fr/userfiles/file/jezazarubifu.pdfIn PDF document text
    • https://supremeroi.com/FCKeditor/file/gaxexexaxubobixo.pdfIn PDF document text
    • http://euskararenginkana.eus/files/galeria/files/fojosoki.pdfIn PDF document text
    • https://olterus.net/contents/files/gutujuduziv.pdfIn PDF document text
    • https://elegune.net/files/galeria/files/juxupafumadig.pdfIn PDF document text
    • https://zbmbudomont.pl/userfiles/file/29142725823.pdfIn PDF document text
    • https://thehouseproduction.net/file/wemorusebet.pdfIn PDF document text
    • http://neza.cz/UserFiles/File/16397128985.pdfIn PDF document text
    • http://mjacz.cz/soubory/files/99482079499.pdfIn PDF document text
    • http://kvarkeno56.ru/userfiles/file/4452952724.pdfIn PDF document text
    • http://kelkenaghshband.com/app/webroot/img/files/gigevovepoximabidabufis.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_off0000b77e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB77E 11068 bytes
SHA-256: ee5e8aaf6bb20a7c8a711ad8b750ee5ab3e3dfe35642876c6a60e4cdd8d3b31e
font_01_sfnt_off0000d0e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0E8 18728 bytes
SHA-256: ab2e2ee4f58d1368d161675a8608325cfc85fc63979e57682facfd4baa510e98
font_02_sfnt_off0001014a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1014A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1