Malicious PDF — malware analysis report

Static analysis result for SHA-256 1cddcb79a3419610…

MALICIOUS

PDF

85.8 KB Created: 2021-09-19 15:03:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: bd092acf603153c7fd97b1e58e59e5a9 SHA-1: a5aa51d20245a7d2cb5280dc41ab3f76f403ecff SHA-256: 1cddcb79a341961023c8d7ed88ac02575530101fa8a279f71ca6d2fda5d95d3d
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which are hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for initiating malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 http://balashixa.inhome360.ru/admin/ckfinder/userfiles/files/65402605596.pdf In PDF document text
    • http://internet-trade.eu/UserFiles/file/bafonerunobile.pdfIn PDF document text
    • http://huucodatlanh.com/userfiles/file/naroforusowuxebubaso.pdfIn PDF document text
    • https://10s317.com/uploads/files/202109121826087822.pdfIn PDF document text
    • http://yigang-lin.com/uploads/files/202109141542265850.pdfIn PDF document text
    • http://gps-ambroisie.com/ressource/site-image/files/99540110353.pdfIn PDF document text
    • http://namhungholdings.com/uploads/ckfinder/files/dudunewowilud.pdfIn PDF document text
    • https://sharjahcements.com/images/bulk_images/files/rerapiloxenaxu.pdfIn PDF document text
    • http://wordtmann.beckbauer.eu/ckfinder/userfiles/files/18726879721.pdfIn PDF document text
    • https://indiansabroad.uk/userfiles/file/vodulesupagunasotedupub.pdfIn PDF document text
    • http://synphabase.ch/upload/file/wowefudidejavukagowoji.pdfIn PDF document text
    • http://hotelrefah4ter.ir/basefile/hotelrefah4terir/files/6882634713.pdfIn PDF document text
    • http://hunicorn.hu/userfiles/file/junafozodixowunuwa.pdfIn PDF document text
    • http://photo-ostrov.com/ckfinder/userfiles/files/fidivowomizebakokaf.pdfIn PDF document text
    • http://itaxabc.com/userfiles/file/20210906162033_2062480591.pdfIn PDF document text
    • http://cameranichietsu.com/luutru/files/18960530544.pdfIn PDF document text
    • http://www.elstar.ru/uploads/files/27263662031.pdfIn PDF document text
    • http://videofilm-tv.ru/content/File/10969475327.pdfIn PDF document text
    • http://carshopm.com/js/upload/files/41608628146.pdfIn PDF document text
    • https://vyaspublicschool.com/ckfinder/userfiles/files/wuzomaxeke.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613696e674f8c---pijod.pdfIn PDF document text
    • http://sgrappresentanze.eu/userfiles/files/47960078644.pdfIn PDF document text
    • https://isleo.com/i_photos/file/25396408413.pdfIn PDF document text
    • https://pvcmikser.com/upload/files/43698373578.pdfIn PDF document text
    • https://securitydm.rs/slicice/file/98839051848.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=iphone+mobile+price+in+bangladeshPDF link annotation
    • 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_off0000ee68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE68 10956 bytes
SHA-256: a480e1f3dfebb0c7aabd562fa607e544045c377ab6f701f4706c2574439f60bd
font_01_sfnt_off0001070d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1070D 16556 bytes
SHA-256: 93c9e80c516390ba5a40560db32f7e6ad39351f1db3cd5aae9d652798e779009
font_02_sfnt_off0001318b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1318B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1