Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a36647f6d9e938f…

MALICIOUS

PDF

71.7 KB Created: 2021-01-11 10:33:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 76ff31ad685ae7137a1447906602a847 SHA-1: 4fd8662dab74ad36fc97b28edf19d3f635062628 SHA-256: 4a36647f6d9e938f9e969dd26414ade646a57442050ea1422596d6f6896c67d6
194 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics, including a critical alert for linking to known malicious redirector infrastructure. The ML classifier also assigned a high probability of maliciousness. The embedded URL leads to a redirector that likely serves a phishing page or a second-stage payload, disguised as a project report. No scripts were extracted, but the PDF structure itself contains malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://cctraff.ru/aws?utm_term=online+examination+system+project+report+in+java In PDF document text
    • https://site-1167951.mozfiles.com/files/1167951/nova_launcher_pro_apk_download.pdfIn PDF document text
    • https://site-1178687.mozfiles.com/files/1178687/absorption_atelectasis_usmle.pdfIn PDF document text
    • https://site-1176140.mozfiles.com/files/1176140/jump_or_die_game.pdfIn PDF document text
    • https://site-1176302.mozfiles.com/files/1176302/midutupubuxe.pdfIn PDF document text
    • https://site-1177229.mozfiles.com/files/1177229/sabig.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391009/normal_5fbb194f7d52f.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/ladojenefe/romepe.pdfIn PDF document text
    • https://s3.amazonaws.com/vekodupiwarobi/holistic_development_definition.pdfIn PDF document text
    • https://s3.amazonaws.com/wujodibu/dafefi.pdfIn PDF document text
    • https://s3.amazonaws.com/nodetuxapabara/tasuvunenulowireme.pdfIn PDF document text
    • https://s3.amazonaws.com/zuguvoxoki/42339446049.pdfIn PDF document text
    • https://s3.amazonaws.com/pibabopuduj/bhakti_songs_video_hd.pdfIn PDF document text
    • https://s3.amazonaws.com/xabalaru/wipefuzaniderokibi.pdfIn PDF document text
    • https://s3.amazonaws.com/vufuzewasi/dorejof.pdfIn PDF document text
    • https://s3.amazonaws.com/buxoparadazegu/partes_de_la_misa_explicada.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000daf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAF5 5412 bytes
SHA-256: a7e2b8da963c988a77a49defd787956ab0a34d972c791b8bdbaeea20b166a7ca
font_01_sfnt_off0000ed5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED5E 10656 bytes
SHA-256: fbffcd423f3d9facdd64f18cbf44bbcb5bfc73a0282d9c82f8a4b1c78010dd48

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