Malicious PDF — malware analysis report

Static analysis result for SHA-256 a80c1d14dad5e8e6…

MALICIOUS

PDF

70.5 KB Created: 2021-04-03 22:42:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: cc4c897b7e499059714b89c3be08759e SHA-1: adff6a9b2487077c4ba311a2da7a9c9d6f1351e3 SHA-256: a80c1d14dad5e8e6652f1e01827dabfe283ba75d6dd392e7f86abb0ba3f46c7e
186 Risk Score

Malware Insights

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

The PDF contains a lure for a movie download, which redirects to a link farm hosted on disposable domains and cloud storage. This behavior, combined with ML and ClamAV detections, strongly suggests a phishing or SEO-based malicious distribution scheme. No scripts were extracted, but the PDF structure itself facilitates the redirection to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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.
  • 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://jumiwimov.ru/strik?utm_term=the+andromeda+strain+2008+full+movie+online+free PDF link annotation
    • http://pawomodom.medianewsonline.com/formato_de_solicitud_de_empleo_para_descargar_gratis.pdfIn PDF document text
    • http://tcerkovniekupola.space/rovanukepeketepipasmn8cp.pdfIn PDF document text
    • http://lg-copyright.com/zukorozivosetibopemovuk563f.pdfIn PDF document text
    • http://watogoda.mypressonline.com/percy_jackson_and_the_lightning_thief_summary_chapter_15.pdfIn PDF document text
    • http://dupuladusudired.mypressonline.com/xejuxaxoxamuripexojupate.pdfIn PDF document text
    • http://gejokakop.mygamesonline.org/dell_latitude_e5400.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/fazujo/kodunuvalu.pdfIn PDF document text
    • https://6998e30b-c911-4113-ab34-4c15204891c7.filesusr.com/ugd/429b25_3a51f977f26b417d81951a8fee0156b4.pdf?index=trueIn PDF document text
    • https://def05634-b969-4265-beeb-1e7d695e9a44.filesusr.com/ugd/6865ce_7569e8faf26e46d8917009b7bed40a22.pdf?index=trueIn PDF document text
    • https://8a5a474a-a671-4857-921d-d1df0ee72544.filesusr.com/ugd/523716_926a9e402e2a4ef18c73cedc6e717ca3.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/rudelazifizuvo/64276790107.pdfIn PDF document text
    • https://a4078cf6-8fa3-420b-ab61-258487076e43.filesusr.com/ugd/a3907e_7c0798005e7745b293bfa397a8139227.pdf?index=trueIn PDF document text
    • https://98771922-91e4-4673-aa0d-7794f4435593.filesusr.com/ugd/b6aaa0_4edc0262e1f740b7bdbe01b994f987b5.pdf?index=trueIn PDF document text
    • https://2a403a33-5f6e-4534-96f9-742aa7325afc.filesusr.com/ugd/d2da83_3c0be3aa2fbd402986862793c7095b82.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wixatax/37970569424.pdfIn PDF document text
    • http://dazejifudora.onlinewebshop.net/auditor_general_report_1mdb.pdfIn PDF document text
    • 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d2e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2E0 5624 bytes
SHA-256: 11ad37eedca7181266bee0125bb1dbc024a4b1887fb0d2e707d5a4c74aca22a7
font_01_sfnt_off0000e5d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5D5 11452 bytes
SHA-256: dd69a93cc7ed550b728f5cc40b0651499adf78267ebd66181555d6868a63cc3f

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