Malicious PDF — malware analysis report

Static analysis result for SHA-256 374560228cc5ab73…

MALICIOUS

PDF

89.2 KB Created: 2021-03-26 15:19:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: ce80e5b4c418170d932725ba287bf24d SHA-1: b8145c3f0f1b82e99cb4c8c3270e6185dfb01fae SHA-256: 374560228cc5ab73a8e34f0d3e8fee74c96e25dcd881c7f81a14dcf8df0b37ac
196 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains multiple heuristics indicating it is designed for SEO link farming and redirection, with a primary URL pointing to a suspicious domain. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious lure.

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.
  • 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.
  • 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://ponafet.ru/strik?utm_term=tokyo+ghoul+season+1+roblox+id PDF link annotation
    • http://pazujiz.mygamesonline.org/ejemplos_de_dialogos_en_ingles_traducidos_en_espaol.pdfIn PDF document text
    • http://duvejiwuxikon.getenjoyment.net/wings_of_fire_bengali_version.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://favekagopu.epizy.com/mamosukow.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/448b4074-e563-4f93-a1fe-a15da7d91a16/kitudadujivididekikisila.pdfIn PDF document text
    • https://s3.amazonaws.com/sizadagazagaj/zirapuxasumozizux.pdfIn PDF document text
    • http://gizogebinide.rf.gd/bones_tv_series_season_5_episode_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/tabobujimo/how_to_reprogram_genie_garage_door_remote.pdfIn PDF document text
    • http://bidajalej.onlinewebshop.net/vernier_calipers_reading_practice.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e0083cd6-431f-46cd-9102-9fdf99ea31a7/which_of_the_following_phrases_best_captures_the_notion_of_efficiency_group_of_answer_choices.pdfIn PDF document text
    • https://s3.amazonaws.com/benubapopikaj/reportar_telefono_robado_claro_el_salvador.pdfIn PDF document text
    • https://18e99e0c-7034-4a8c-9069-267580a295b8.filesusr.com/ugd/b337f5_491029660fbe4e7496b5c9574995ef54.pdf?index=trueIn PDF document text
    • http://zekakodususebu.epizy.com/14173304639.pdfIn PDF document text
    • http://xiwozoget.atwebpages.com/how_to_locking_hubs.pdfIn PDF document text
    • https://s3.amazonaws.com/nerugiraxura/south_african_education_system_history.pdfIn PDF document text
    • http://geforagegi.atwebpages.com/volare_chords.pdfIn PDF document text
    • https://9387bd13-3746-4408-b474-2867f26e464d.filesusr.com/ugd/ace02d_2201e59f844748e5b512d5060c666e49.pdf?index=trueIn PDF document text
    • https://790985df-dfec-4a08-b509-00f37668cf87.filesusr.com/ugd/a421e3_52a0a2f056f14ebeb2eae66166bd3e9a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bisute/darebejexilesulavul.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3284a2f1-6e12-4b99-8ed9-1732d822cc5b/14861169349.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_off00011c3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C3C 5464 bytes
SHA-256: 06f2ce777623c729948f6b6c964e1420c8263e68cbc7c858760f0ef3adbc6225
font_01_sfnt_off00012edb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EDB 12252 bytes
SHA-256: 74d9905a849938a1c22b4210079642b78a5699519f984b90de79750f8c552c29

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