Malicious PDF — malware analysis report

Static analysis result for SHA-256 afc9d3e18b11f6f3…

MALICIOUS

PDF

73.9 KB Created: 2021-02-22 07:05:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 315f892c6dc26eba1fb1a979ca81f4be SHA-1: c62770761e939eb6b1bfaf5600a88c82ab394a6e SHA-256: afc9d3e18b11f6f3a06a3a3a68c29962888d885415982cbc362169caa23ad151
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 as a link farm, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://maypoin.ru/strik?utm_term=general+release+of+all+claims+template PDF link annotation
    • https://narufana.weebly.com/uploads/1/3/4/6/134653256/1744cfb77.pdfIn PDF document text
    • https://cdn.sqhk.co/fovuxugo/njjViZs/skin_for_roblox_download_apk_unlimited_robux.pdfIn PDF document text
    • http://eeuuurrrrr.space/29633376249s3ohh.pdfIn PDF document text
    • https://cdn.sqhk.co/vuwipabobatu/cgiHhfV/tugerovavasumoza.pdfIn PDF document text
    • http://bt-management.website/verifone_mx915_factory_resetb4tyg.pdfIn PDF document text
    • https://betoxugibujimiv.weebly.com/uploads/1/3/1/0/131071043/vezenoxenogejot.pdfIn PDF document text
    • https://roviselazadavuw.weebly.com/uploads/1/3/4/0/134040559/nukivosub_kuzodevux.pdfIn PDF document text
    • http://plusstore.pro/91097312537qy4gn.pdfIn PDF document text
    • http://raisinshq.club/bailey_and_love_surgeryfkm29.pdfIn PDF document text
    • https://cdn.sqhk.co/xawobovuji/hijbbig/godokubekumalivopovef.pdfIn PDF document text
    • https://cdn.sqhk.co/zapimafe/agiGihi/city_university_of_hong_kong_pcll_admission.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/zakunafu/website_templates_wordpress_free.pdfIn PDF document text
    • https://s3.amazonaws.com/gomakobez/30786024684.pdfIn PDF document text
    • https://s3.amazonaws.com/jemazejodep/pokapulivezovawuxirivev.pdfIn PDF document text
    • https://s3.amazonaws.com/kegovev/sample_employment_reference_letter_template.pdfIn PDF document text
    • https://s3.amazonaws.com/ganubifirigevi/app_lock_code.pdfIn PDF document text
    • https://s3.amazonaws.com/saziwijaxodav/vibozobawowilixu.pdfIn PDF document text
    • https://s3.amazonaws.com/xisefowu/78496576429.pdfIn PDF document text
    • https://s3.amazonaws.com/vifusupegiza/49224271538.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_off0000e44b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE44B 5192 bytes
SHA-256: e216e84ec6ecbfc57ccdcde0ddfadeba64c37ad02164bb07cca3410b3a3ba3eb
font_01_sfnt_off0000f5e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5E5 10172 bytes
SHA-256: b94ae99ec37de84ed7c9bbdc1c4218e970bc7d5998fa34b4cb45d0303ee6cbb7

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