Malicious PDF — malware analysis report

Static analysis result for SHA-256 31fdb80fb40215e8…

MALICIOUS

PDF

74.1 KB Created: 2021-09-12 17:06:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7f8b9027803c499fe6c8e2d2d8366737 SHA-1: 30706323559e46835fcdb5cea18cb98e8c0181f7 SHA-256: 31fdb80fb40215e8180946a51e714c874af3cf46b9153fdcfd38004122e5abe7
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs, many of which point to disposable hosting or link farms, indicating a strong intent to redirect users to potentially harmful sites. While no scripts were explicitly extracted, the nature of the embedded URLs and the detection signatures suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://laborke.ru/uplcv?utm_term=satellite+director+free+dish PDF link annotation
    • http://sp2wronki.pl/fotki/fotki/file/bolitori.pdfIn PDF document text
    • https://essaidafm.com/uploads/FCK_files/file/71433472595.pdfIn PDF document text
    • http://ana-jsc.com/upload/files/75996800752.pdfIn PDF document text
    • https://eminentland.com/admin/userfiles/files/detedatesuruninazi.pdfIn PDF document text
    • http://staresecurity.com/userfiles/file/5253410824.pdfIn PDF document text
    • http://thebankcardservices.com/uploads/files/15300511048.pdfIn PDF document text
    • http://hoclaixebinhthuan.com/upload/contentFile/file/30223837405.pdfIn PDF document text
    • http://namadagaskare.ru/ckfinder/userfiles/files/65033757350.pdfIn PDF document text
    • https://lochoanggia.com/upload/files/liwexaxumo.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613170241b346---88283660955.pdfIn PDF document text
    • https://equinox-e.com/upload/UserFiles/file/rabosaget.pdfIn PDF document text
    • http://aimecostruzioni.it/userfiles/files/64688646362.pdfIn PDF document text
    • https://kochitaxirental.com/ckfinder/userfiles/files/xefenilevol.pdfIn PDF document text
    • http://fertilityupdates.com/userfiles/files/makigufalo.pdfIn PDF document text
    • https://bodykneadstherapy.com.au/ckfinder/userfiles/files/43107261798.pdfIn PDF document text
    • https://myparrotfood.com/user_files/files/20764657248.pdfIn PDF document text
    • https://uat-tunisia.com/userfiles/file/zapozer.pdfIn PDF document text
    • http://nawoo.net/userData/board/file/gamupew.pdfIn PDF document text
    • http://safeabortionnepal.com/userfiles/file/pataler.pdfIn PDF document text
    • https://houstoncoinshow.org/FCKeditor/file/71131096381.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613b320d68a46---julevidugoxasu.pdfIn PDF document text
    • http://rklatex.com/userfiles/file/raroxomenadafanubazitab.pdfIn PDF document text
    • https://cristalparkhotel.com/ckfinder/userfiles/files/jokofiga.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_off0000c06f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC06F 10544 bytes
SHA-256: bc90c0047167f496b7c0ce1f8d0de8d6a457a5f448decd5f5dc86747b056e3be
font_01_sfnt_off0000d888.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD888 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f09a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF09A 16528 bytes
SHA-256: 85b8b45c3d2e4f165fe1f8e09903b9e4f55011dd5dcc4ac495238655ceca2ede

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