Malicious PDF — malware analysis report

Static analysis result for SHA-256 c03a960f7edca7dd…

MALICIOUS

PDF

183.3 KB Created: 2021-02-13 11:30:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 71b2795fede130428c53f1f28fbfc0a5 SHA-1: d854a1f6898bd2fe8676bfa5b0bbfd9549c587dd SHA-256: c03a960f7edca7dd02e6d0ddb565294d5e782c0a08bb39d23cf39d55f08668d3
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains multiple embedded URLs, with a high-confidence ML classifier and ClamAV detection indicating malicious intent. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests a link farm designed to obscure the true destination, pointing towards a phishing or malware distribution scheme. No scripts were extracted, but the presence of external URIs is sufficient evidence for a malicious attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

Heuristics 5

  • 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 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://baarspo.ru/wix?keyword=%25E4%25B9%2590%25E8%25A7%2586+%25E7%2594%25B5%25E8%25A7%2586+app PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4418963/normal_5fc704280fd52.pdfIn PDF document text
    • http://virnet77.ru/kumobasepevar23il.pdfIn PDF document text
    • http://b4shop.icu/psychology_sensation_and_perception_quiz_answerslbr05.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492294/normal_601d602324d2d.pdfIn PDF document text
    • http://good-production17.site/diy_mask_pattern_with_filter_pocket_and_ties4t0yb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380858/normal_601a83ca3b346.pdfIn PDF document text
    • http://sedisifoxe.22web.org/nimemiwivu.pdfIn PDF document text
    • http://sezituza.66ghz.com/aboorva_sagotharargal_bgm_music.pdfIn PDF document text
    • http://wspring.space/normal_renal_artery_doppler_waveformhd5bx.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/sisaxu/fadezipukositijo.pdfIn PDF document text
    • https://s3.amazonaws.com/dobesogum/guluburojisavu.pdfIn PDF document text
    • https://s3.amazonaws.com/jujadodedaruxix/bepodulodal.pdfIn PDF document text
    • http://mebukaronov.epizy.com/dv_lottery_application_form_2021.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ce99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE99 153196 bytes
SHA-256: a24027f56ae5d0d511b7853d040117b7c6b12a708360c0aa8796d92a939ba73e
font_01_sfnt_off00029081.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x29081 3664 bytes
SHA-256: 59a7b565d1e22d696684ac28dbe794555f4c85ceb5797f42ad92fefcfa426c2e
font_02_sfnt_off00029d71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x29D71 4412 bytes
SHA-256: c0fafd46744aee9f9ab4193c1feca1eaedda2c70f2747f2452d8f7b8dd24e29f
font_03_sfnt_off0002ac84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2AC84 9452 bytes
SHA-256: 6756de5cd0e091a33061001af3cce842b02fa4e15cfbd9edddfc355da776381a

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