Malicious PDF — malware analysis report

Static analysis result for SHA-256 5aa75439b30f9f2c…

MALICIOUS

PDF

73.3 KB Created: 2021-09-11 17:44:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: bcd4a4509b41e955805ec561310f77d6 SHA-1: 13aa06d22f4122c034d5d6791ffaeff5a735e8c1 SHA-256: 5aa75439b30f9f2c9d273c9a81e78b9afe24bc48a8df811d00ab95399828353a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV and an ML classifier as malicious, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the presence of numerous embedded URLs suggest the document is designed to redirect users to potentially harmful websites. While no scripts were explicitly extracted, the nature of PDF exploits often involves embedded JavaScript for malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://smidgel.ru/uplcv?utm_term=toca+life+world+download+free+android PDF link annotation
    • http://mfcpavpos.ru/file/pitexaxabakevisapuzeje.pdfIn PDF document text
    • http://datcat.vn/2018/file/buzomob.pdfIn PDF document text
    • https://mimpidia.com/contents/files/32220093534.pdfIn PDF document text
    • https://www.prshots.com/ckfinder/userfiles/files/paxureminowasefitoz.pdfIn PDF document text
    • https://www.tamilsaga.com/ckfinder/userfiles/files/lekavebufe.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613543cd043c7---4865272770.pdfIn PDF document text
    • https://trvstore.com/userfiles/file/pikufe.pdfIn PDF document text
    • http://hattingtoemrerogsnedker.dk/userfiles/file/debemaxiwor.pdfIn PDF document text
    • http://clinicaveterinariailmarzocco.it/userfiles/files/77521577873.pdfIn PDF document text
    • https://autoradiator.mn/uploads/ckfinder/files/71085017199.pdfIn PDF document text
    • http://aldo-ins.com/userfiles/file/dokirularazesajinabi.pdfIn PDF document text
    • https://begili.com/uploads/image/files/27937981048.pdfIn PDF document text
    • http://hengtongrongshang.com/jingkelun/userfiles/files/20210906201208.pdfIn PDF document text
    • https://hongmao.tw/uploads/files/202109092112034111.pdfIn PDF document text
    • https://www.newhorizonscrisiscenter.org/ckfinder/userfiles/files/vusagimaveguxu.pdfIn PDF document text
    • https://sanagustin.cl/files/79374120512.pdfIn PDF document text
    • https://yukkumpulgroup2.com/contents/files/saxezigaxuduwimudosulif.pdfIn PDF document text
    • http://itfkarnataka.com/cvsprojects/SSK/Source/2.0.0/images/files/sasesowiwexadisox.pdfIn PDF document text
    • http://schokofontaene.de/idata/11573165647.pdfIn PDF document text
    • http://compufoxmail.com/FCKeditor/editor/filemanager/connectors/userfiles/file/nabopibi.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b52ebb7f9f---88786034195.pdfIn PDF document text
    • https://ostrichtours.com/ckfinder/userfiles/files/pitekodunomitibuzo.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_off0000b669.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB669 18844 bytes
SHA-256: 56ef8475a54273faa4e25d89409985397e4666588b25178942732d5ebd128a6b
font_01_sfnt_off0000e69a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE69A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000feb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEB1 10252 bytes
SHA-256: 43271f79655754840dd04327b6010fa41a590db2f30d166e59e44c81adbfb5d5

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