Malicious PDF — malware analysis report

Static analysis result for SHA-256 1860a504638f4bc9…

MALICIOUS

PDF

78.2 KB Created: 2021-03-31 08:09:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9695d9a605c70623e8ea20de58531482 SHA-1: 4defcafc1a1004ce04589748050a1e5a50547f1c SHA-256: 1860a504638f4bc930a6599618ac4d6521b7686171dfd832721a5b20b11c2d7e
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains a lure related to bank promotions and payment instructions, a common tactic for business email compromise (BEC) attacks. It also includes a large number of external links, many pointing to Weebly-hosted PDFs, suggesting a link farm or redirection mechanism. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise pattern
  • 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://soxebez.ru/award?keyword=bank+promotion+books+pdf
    • https://tevukebejesa.weebly.com/uploads/1/3/2/6/132695492/4973948.pdf
    • https://rudusixan.weebly.com/uploads/1/3/0/7/130775573/kalomejika.pdf
    • http://gililofus.medianewsonline.com/sociology_class_11_book_2.pdf
    • https://xunitumewotoril.weebly.com/uploads/1/3/4/6/134612341/1613165.pdf
    • https://sawatulaboror.weebly.com/uploads/1/3/2/7/132710797/wefirapojomuzinot.pdf
    • https://zewadozodatigi.weebly.com/uploads/1/3/4/3/134337643/8338311.pdf
    • https://wiverovozojuja.weebly.com/uploads/1/3/0/7/130739864/6ac10c079df872.pdf
    • http://pinegobojefo.getenjoyment.net/anatomy_and_physiology_of_uterus.pdf
    • http://mixezitubut.mygamesonline.org/jobisadowopozatajubek.pdf
    • https://kobetuditi.weebly.com/uploads/1/3/4/4/134446504/9a241650ee4.pdf
    • http://lirebuwoke.mygamesonline.org/capital_budgeting_techniques_solutions_gitman.pdf
    • https://dibuponabax.weebly.com/uploads/1/3/4/3/134340508/0c43404.pdf
    • https://tuzulenoj.weebly.com/uploads/1/3/4/8/134866727/da0a71.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/vaxebisapesi/ontario_boating_test_answers.pdf
    • https://s3.amazonaws.com/xalexojaxipud/getamome.pdf
    • https://8c17aa34-c454-4d6c-a218-8929c845e329.filesusr.com/ugd/808cd0_6f01bb962645470f82ed07193a6e81d1.pdf?index=true
    • https://s3.amazonaws.com/tazopaju/clown_face_cartoon_template.pdf
    • http://wepogevadapafa.atwebpages.com/admiralty_charts_catalogue.pdf
    • https://5a1138df-423b-4a5d-a7c7-36223740754e.filesusr.com/ugd/a72fa8_395a94029b904431a7e4349bd3f80b60.pdf?index=true
    • https://5613ab86-cfe5-4642-b9e1-29ab5e510d76.filesusr.com/ugd/79e000_3a450689a44640ebad6b673f4df92399.pdf?index=true
    • https://b20aee1f-b1b7-4e4e-be5e-d884e4ece670.filesusr.com/ugd/10e3af_305394ae372248168d5d41ffe1caf32c.pdf?index=true
    • https://s3.amazonaws.com/xirixepo/beautylish_the_ordinary_regimen_guide.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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f3e6.bin
dacdaf34d000915a204b43f30ef17c231a12ec62e0d337464e8852b2f8514086		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF3E6 5408 bytes
font_01_sfnt_off00010632.bin
756216d7557fc5c3054d4cf35dfada03bbfe10ae4c139231f632f9dea7807567		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10632 10964 bytes

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