Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0d79a79eb0ebdbb…

MALICIOUS

PDF

73.3 KB Created: 2021-03-20 22:40:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3b00258d554a7d10641418ec4f557c72 SHA-1: 830c4f6366f61bfe46fca8fa16d76befeab5b32e SHA-256: f0d79a79eb0ebdbb772323384c77acc74de324dc6860ff8c63ed84e4df649071
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which are generated SEO-style links pointing to other PDF documents. One prominent external URI, 'https://jacksth.ru/wix?keyword=2000+yamaha+v+star+1100+spark+plug', suggests a lure to a malicious website. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://jacksth.ru/wix?keyword=2000+yamaha+v+star+1100+spark+plug
    • https://cdn-cms.f-static.net/uploads/4382405/normal_600a02faba1a3.pdf
    • http://zonafuluza.iblogger.org/dudibepumovuj.pdf
    • http://jukavoluv.iblogger.org/danirerevetuzewimamenake.pdf
    • https://cdn-cms.f-static.net/uploads/4423454/normal_6050ca3ba4630.pdf
    • https://static.s123-cdn-static.com/uploads/4377414/normal_5fcbe08f175f1.pdf
    • https://cdn-cms.f-static.net/uploads/4476941/normal_5fd1ee4eb39b0.pdf
    • https://cdn-cms.f-static.net/uploads/4409123/normal_601845148d045.pdf
    • http://wazasipu.iblogger.org/65014115204.pdf
    • http://futubog.22web.org/noxexuvut.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://gevazobi.rf.gd/como_trabaja_un_alternador_de_auto.pdf
    • https://s3.amazonaws.com/xokebore/aankh_maare_hd_song.pdf
    • https://s3.amazonaws.com/punagilelabon/norekajiwiko.pdf
    • http://gofudawaropuz.epizy.com/11423236290.pdf
    • https://711a90e7-97f2-4eab-8690-3003ec1e9b64.filesusr.com/ugd/a0905b_d350cac285e04c689743dc93911ea4be.pdf?index=true
    • https://s3.amazonaws.com/nunakixuma/kukujejuwajixupexew.pdf
    • https://e8677ced-6330-435e-8237-200fb10408a4.filesusr.com/ugd/a4c1fa_da6c2c0596f342858fe0a9271fe0074c.pdf?index=true
    • https://s3.amazonaws.com/vinejivunitego/45968461139.pdf
    • https://a50dbba5-e4fd-40cc-afa9-a45495a5accf.filesusr.com/ugd/7f929b_7730b995304f46fab5767677980eda98.pdf?index=true
    • https://3cd6846c-369c-4875-9c63-132df726a2dd.filesusr.com/ugd/7ab50f_a2111f6583c240ddac5abaaadeaaf679.pdf?index=true
    • https://27f1a270-5048-4778-87f0-574dfe85248a.filesusr.com/ugd/b7306e_0839840ca4c345c190346c75a9788431.pdf?index=true
    • https://s3.amazonaws.com/nakuzafol/dedifiresux.pdf
    • http://manutilo.epizy.com/portuguese_water_dog_grooming_guide.pdf
    • https://s3.amazonaws.com/remavuj/kingdom_of_the_wicked_book_2_read_online.pdf
    • https://s3.amazonaws.com/zevutebulaworel/log_book_in_excel_sheet.pdf
    • http://nuvitaros.epizy.com/free_templates_admin_bootstrap_4.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_off0000e128.bin
e85fe89375152944b7f0279436073565bf476ecd6a1db5aca4e6bcafcc6282c4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE128 5688 bytes
font_01_sfnt_off0000f46d.bin
25b0722250dd998c0f5a7f277b9c920a92cd22d8000fe43fafcc9fadb1732e82		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF46D 10276 bytes

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