Malicious PDF — malware analysis report

Static analysis result for SHA-256 736841a91f2c1b00…

MALICIOUS

PDF

85.9 KB Created: 2021-04-06 20:20:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 175105a58399547ab490aba51bc0bfca SHA-1: 11ea4404b83b6342e810000fa3d28b07ec48b55b SHA-256: 736841a91f2c1b003f5eaffa77dc3ead9162bea017918d8a9ebc1559a1811f5c
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are SEO-optimized to appear as legitimate documents, a common tactic for link farms and phishing. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution via the embedded URLs. No scripts were extracted, but the PDF structure itself is indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://leonvi.ru/award?keyword=surface+area+and+volume+of+shapes+pdf
    • http://mosquito.codes/canto_de_pjaros_canarios_campeones7kfwi.pdf
    • https://nifirasevaxo.weebly.com/uploads/1/3/4/7/134756957/8243891.pdf
    • http://didibemez.scienceontheweb.net/coroners_act_1962.pdf
    • https://geredape.weebly.com/uploads/1/3/4/3/134349068/ce321a40d7110.pdf
    • https://zenamuvevabun.weebly.com/uploads/1/3/1/4/131453902/185714.pdf
    • http://bamirajewenexo.medianewsonline.com/48953717514.pdf
    • http://antonioit.fun/18270872974w2os1.pdf
    • https://werirubiteda.weebly.com/uploads/1/3/5/9/135972418/ximikogeluroredar.pdf
    • http://lisolu.org/66044148336j3r9i.pdf
    • https://lobusejorul.weebly.com/uploads/1/3/5/3/135338183/de3ef66.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://safedoguno.onlinewebshop.net/jabewi.pdf
    • https://ab2ac9d4-4772-4872-829d-c19fde0a4f90.filesusr.com/ugd/b919b3_41d110a9fb454c9a94d9de47a3ba4abd.pdf?index=true
    • https://uploads.strikinglycdn.com/files/8964f4b1-d9cb-4183-abc0-414a2a5a42d2/cant_recover_my_fb_account.pdf
    • https://7a48fde5-f9d1-4ce4-84a2-8b156d245d18.filesusr.com/ugd/8127dd_e9e416a305f54d2ea2919590e3c44c5e.pdf?index=true
    • https://5c126656-fc4f-473b-8c99-11744d2e1b96.filesusr.com/ugd/abd8ec_e6d48da3438745fb90dd628987d4c457.pdf?index=true
    • https://uploads.strikinglycdn.com/files/54e950f0-1f2d-494d-bc4e-666f5c3776df/ti-30x_iis_scientific_calculator_online.pdf
    • https://uploads.strikinglycdn.com/files/5a2a29b6-b558-4f93-aba6-99f717671fbe/dell_precision_m4600_memory_upgrade_instructions.pdf
    • https://88211235-bf86-4d40-a6ec-a052db2f682e.filesusr.com/ugd/94e5ef_d57147bedea14a14b3e8b6b73da23eb2.pdf?index=true
    • http://fajenadiwizowo.atwebpages.com/java_ee_spring_spring_mvc_mybatis.pdf
    • https://uploads.strikinglycdn.com/files/7165bff7-9c43-4ffe-8a7e-42ab5169b396/dibusevenidopositoxuxi.pdf
    • https://uploads.strikinglycdn.com/files/aa09545d-4822-403e-b69b-d3c57c634549/29113563509.pdf
    • https://2eda13a9-9e0f-47dd-bbfa-a9a5028a3314.filesusr.com/ugd/61c57f_7e5e655357b64068a172af64801078c7.pdf?index=true
    • https://ec5c17a1-061e-4a2c-a9e6-b3561ba71229.filesusr.com/ugd/299074_855faa235108462b97034c08f1781f3f.pdf?index=true
    • 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://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fc27.bin
1dc82c178240d0899889260f9dee515d3f70e60b77c792b5043e47e8ad51b9cf		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFC27 5452 bytes
font_01_sfnt_off00010f29.bin
5c61bf824126147ccf35dcd2d408eafe75fa201175b3982efd3163961a136a48		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10F29 5556 bytes
font_02_sfnt_off000121ee.bin
1c57f8b7a84ab56a3d382c29a4899620dbf23b36d02483e48eb831021526db37		 pdf-font-stream PDF embedded font (sfnt) at offset 0x121EE 12184 bytes

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