Malicious PDF — malware analysis report

Static analysis result for SHA-256 f40cbd755d9c3082…

MALICIOUS

PDF

95.5 KB Created: 2021-09-16 16:42:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: b199b8e7e85f92fea4135db5c2cb4c50 SHA-1: f73a6e11854adab214a4ade74ce4efd6447549e0 SHA-256: f40cbd755d9c3082bfb8287e86f88fabafaebb9aefabde0712dcf6c037794efb
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1566.002 Spearphishing Link

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically identifying it as a phishing attempt impersonating PayPal. The document contains an embedded URL that redirects to a non-PayPal host, indicating a credential harvesting scheme. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest an attempt to lure users into clicking malicious links, likely leveraging JavaScript for obfuscation or redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Brand-impersonation credential phishing lure high SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: call-to-action link host does not match the impersonated brand: https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=eelphone+android+unlock+crack.
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://stadion-zarya.ru/ckfinder/userfiles/files/77225289133.pdf In PDF document text
    • https://hunde-katzen.at/soubory/24133331264.pdfIn PDF document text
    • http://tdbakademi.org/userfiles/files/kegujasugilal.pdfIn PDF document text
    • https://xn--72ca1bzcdf9cg5df4n5a8cei.com/userfiles/files/joxituzefam.pdfIn PDF document text
    • http://tbeaindia.com/userfiles/file/nelumafowotumurunuwuduri.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/16137eb8d5c9d0---65638875711.pdfIn PDF document text
    • http://spellenindex.nl/images/uploads/vaferufivuzevan.pdfIn PDF document text
    • http://korsorlampang.net/user_img/files/68373940247.pdfIn PDF document text
    • http://wwsm-hk.com/files/file/pubosavikevonenalemaguzo.pdfIn PDF document text
    • http://perfekt-dom.pl/designhome/admin/userfiles/file/bujewi.pdfIn PDF document text
    • http://www.hkrns.org.hk/ckfinder/userfiles/files/dubogulimezunejitejus.pdfIn PDF document text
    • https://asset-books.com/userfiles/file/zodasefawutaverukodoki.pdfIn PDF document text
    • http://fermobkorea.com/userfiles/file/20210913022151.pdfIn PDF document text
    • https://maytinhdalat.vn/images/uploads/files/xegamudizixujisufi.pdfIn PDF document text
    • http://tdsns.ru/userfiles/file/15698096450.pdfIn PDF document text
    • http://studiotecnicolari.it/userfiles/files/liwivetusi.pdfIn PDF document text
    • http://gazomotor.com/allinone/file/71347983757.pdfIn PDF document text
    • http://blgjad.com/upload/files/79460905291.pdfIn PDF document text
    • http://autoscuolauniversale.it/userfiles/files/52524796776.pdfIn PDF document text
    • https://toyotaautobody.com/ckfinder/userfiles/files/nubikajibosi.pdfIn PDF document text
    • http://lngpetro.com/userfiles/file/dibipopuxatotaxexeruwalir.pdfIn PDF document text
    • https://uzsienis.cvzona.lt/resources/img/files/sagukizusimuzefew.pdfIn PDF document text
    • http://musthighschool.mn/ckfinder/userfiles/files/62740432680.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=eelphone+android+unlock+crackPDF 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_off00010bc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BC3 20236 bytes
SHA-256: c31a4b1607b2a0f138ade44a033d75412031f4c3f5e0edf12395b17e83cf4998
font_01_sfnt_off00014090.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14090 10520 bytes
SHA-256: 2c3181f3d1e07aba415e64b0894ca094a2bd6b11e2eea7ef07dff53d5b04a76b
font_02_sfnt_off0001585b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1585B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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