Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b7538d656a0e3fc…

MALICIOUS

PDF

76.9 KB Created: 2021-03-25 14:30:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2f1bb7a872831183627c72dde691ebba SHA-1: aee518e36721dd5c07af96e377f3b47f30be6cf5 SHA-256: 2b7538d656a0e3fc5c4200ba2b00b6ec3d4eef0a86a1529f724b647be13f3cdf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate maliciousness. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious intent, likely to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://zajinet.ru/strik?utm_term=how+to+help+students+succeed
    • https://cdn.sqhk.co/wobuwozavenu/ZYji3KG/house_of_fear_surviving_predator_pro_mod_apk.pdf
    • https://gobodanugamo.weebly.com/uploads/1/3/4/8/134862857/4028119.pdf
    • https://cdn.sqhk.co/tazifawixax/ibWidjd/18197551552.pdf
    • https://cdn.sqhk.co/zaborofisi/d0lb1ia/59254223680.pdf
    • https://cdn.sqhk.co/pesasotiro/giphdz3/zunojenu.pdf
    • https://jowapiwinutakun.weebly.com/uploads/1/3/4/3/134365581/fceb3.pdf
    • https://cdn.sqhk.co/motixekotet/mHlgtjc/11171548257.pdf
    • https://vixozomaregug.weebly.com/uploads/1/3/1/3/131398278/9790825.pdf
    • https://kizujaxaluw.weebly.com/uploads/1/3/4/3/134393650/mubobo_gotumivefotobog_wavusan_tibevepabefas.pdf
    • https://cdn.sqhk.co/nujamuxeg/ho4ghoz/fun_literacy_games_ks1.pdf
    • https://cdn.sqhk.co/zoburawava/ghhgh5r/35210531090.pdf
    • https://jewelilug.weebly.com/uploads/1/3/4/3/134331877/8631da6639f35ae.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/6998ac3e-3a5b-4c86-94d6-94c7a224cf36/wuzokap.pdf
    • https://s3.amazonaws.com/dujepav/jujaniwiwapiladipuje.pdf
    • https://uploads.strikinglycdn.com/files/87a7fcce-ee55-4ead-8a76-6c1964e1695f/panelview_1000_programming_manual.pdf
    • http://mavavopem.rf.gd/72832121311.pdf
    • http://penalat.rf.gd/zuwez.pdf
    • https://uploads.strikinglycdn.com/files/4c749326-3fdb-401d-8ef6-2eaffb167e15/what_is_erbs_palsy.pdf
    • https://s3.amazonaws.com/wurivuve/8653366848.pdf
    • https://s3.amazonaws.com/mojivikapeti/92193347848.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_off0000effd.bin
5bf1ad1daf3e4e397fe9e2471e027a24aa8e05481ea4f094ad5d116909a11917		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEFFD 4908 bytes
font_01_sfnt_off000100c0.bin
c02b8dea7e0a2d31b36f5f32fb29bbe975274eca2e36cb7953a82fee845b191c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x100C0 11244 bytes

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