Malicious PDF — malware analysis report

Static analysis result for SHA-256 9bbde68f188e48aa…

MALICIOUS

PDF

70.0 KB Created: 2021-09-25 00:13:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 044ffaa7368356281c31fcd33a655471 SHA-1: f039d429de3b2d2c3ba9c31793a16daf15607d2a SHA-256: 9bbde68f188e48aa394f5aa7953494c038b075945898f27b9c1a8da22ba5b168
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by multiple heuristics, including a critical ClamAV detection and an ML classifier flagging it as malicious. The PDF contains numerous embedded URLs pointing to various domains, suggesting a link farm or phishing lure. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates these links are likely disposable and intended to obscure the true malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 http://franzoesischebulldoggen.eu/userfiles/file/53024234328.pdf In PDF document text
    • http://nexxstep.nl/userfiles/file/gebuguxumanazi.pdfIn PDF document text
    • https://etonbio.com/newsLetters/images/file/68138709902.pdfIn PDF document text
    • http://fqcycpa.com/jingkelun/userfiles/files/20210911131503.pdfIn PDF document text
    • https://haidangpc.com/contents/files/giforujosufuzukumuzof.pdfIn PDF document text
    • http://nwatchonline.net/userfiles/file/wusogotejimosek.pdfIn PDF document text
    • http://copingconversations.com/userfiles/file/pakoxopu.pdfIn PDF document text
    • http://synowka.pl/galeria/file/95453297747.pdfIn PDF document text
    • http://parfumland.sk/upl/86263145375.pdfIn PDF document text
    • https://exam11.menapoint.com/app/webroot/upload/files/70383395214.pdfIn PDF document text
    • https://mollis.rs/files/vareropigasazazemobi.pdfIn PDF document text
    • http://smeeing.com/userfiles/files/97225743124.pdfIn PDF document text
    • https://cooperspick.com/files/22095392763.pdfIn PDF document text
    • https://igruppe.no/ckfinder/userfiles/files/37001296550.pdfIn PDF document text
    • http://travellerisland.com/files/82741128929.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16144e936acc78---65064779009.pdfIn PDF document text
    • https://artgreen.vn/attachment/files/pujafimunovo.pdfIn PDF document text
    • http://studiotecnicofrisoli.com/userfiles/files/jamepuxid.pdfIn PDF document text
    • http://aedjtjdshbf.pretty-match.com/upload/files/13658866074.pdfIn PDF document text
    • http://falegnameriacastiglione.it/userfiles/files/tomanukobili.pdfIn PDF document text
    • https://evergreencans.com/userfiles/file/32416272571.pdfIn PDF document text
    • https://spheresignal.com/app/webroot/userfiles/files/nuvusamakijevevafutozime.pdfIn PDF document text
    • https://cahayamimpi1.com/contents/files/33043525701.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=asphalt+nitro+cheatPDF 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_off0000b1b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1B5 16100 bytes
SHA-256: f772dd59eba610d332991d1a50166120977fbb1bf1add9dc65c774275f60fdf8
font_01_sfnt_off0000dab3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAB3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f2ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2CA 10452 bytes
SHA-256: 49ccc0606b97a458e6e0abc3ff0fbdc63c6df4697dd253af4967ae726c0a9d5d

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