Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ab3a3af88b6b4a8…

MALICIOUS

PDF

81.3 KB Created: 2021-09-17 19:11:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4e5b6bfd5576635bf831b58e08a54ee5 SHA-1: 29b815bd6d3b1769aa14c2dad97c68f26c81aafa SHA-256: 8ab3a3af88b6b4a8dd8fbc93e3324e0a0d3e87516b1317e0306074a3d1eadee2
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to disposable domains, a common tactic for distributing malware or phishing content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicates a malicious intent to create a deceptive link farm. The ML classifier and ClamAV detection further confirm the malicious nature of the file, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://pistant.ru/uplcv?utm_term=get+android+apps+on+windows+10
    • http://greatwalledmond.com/ckfinder/userfiles/files/gukuwex.pdf
    • http://autolavaggiocraparotta.it/userfiles/files/vawuga.pdf
    • http://sushiloverca.com/uploads/files/mubadafamutawu.pdf
    • http://gzsjlt.cn/userfiles/file/lesukofemadipoxokuraleli.pdf
    • http://esteel.my/userfiles/file/61848249830.pdf
    • http://krukaiart.com/userfiles/files/rejewafaxanurabigoxi.pdf
    • http://skene.es/userfiles/file/moxujovuni.pdf
    • https://vialivonica.eu/userfiles/files/zesagitonepo.pdf
    • http://koreaseowon.com/ckupload/files/modajonafozivovumi.pdf
    • https://www.asoriofrio.org/ckfinder/userfiles/files/vatarepazenabidudajedunas.pdf
    • http://floralojistik.com/userfiles/file/kidudukulojane.pdf
    • https://cian.hr/userfiles/file/59077339877.pdf
    • https://vietnaminsight.biz/ckfinder/userfiles/files/5750887688.pdf
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/vbol8k4b9vtp5gkvca5k3848a5/48535237034.pdf
    • http://itaxabc.com/userfiles/file/20210901193035_1369599425.pdf
    • https://kalitelivideoizle.com/resimler/files/wexinasinadapelemazogijav.pdf
    • http://dailyxedayhang.com/userfiles/files/sonoripudusetosuzezokiti.pdf
    • https://jungleflightchiangmai.jungle-flight.com/Uploads/files/nonobaximabizofolupiwu.pdf
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/8279121ead42c30b0dfddb58975420c2/91599034312.pdf
    • https://berettyotv.hu/userfiles/files/90386824584.pdf
    • http://psycare-spb.com/userfiles/file/gimifawugovofeburefofifow.pdf
    • http://ceskylakros.cz/userfiles/file/rugosumutexukozoxe.pdf
    • https://tgvl.in/uploads/fck/files/zixomirulurilupunez.pdf
    • https://jakspravnenapsa.cz/userfiles/file/zotufanukusupuwesokojot.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d9ea.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD9EA 16792 bytes
font_01_sfnt_off0000f201.bin
14289ab75fdfcde5ff21d32c87f586800865d7464d529a06bf3166c2053742a7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF201 10640 bytes
font_02_sfnt_off00010a96.bin
64a31d59ec82b521af6240e02118b89545c6134fdc524f57188d1a1ef02b4c45		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10A96 17368 bytes

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