Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a59ded4728a3610…

MALICIOUS

PDF

76.8 KB Created: 2021-05-16 11:24:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 071a92a334f58c7bc2ad433b10a6bd39 SHA-1: 5da39bcad17ed904050e8d0e79cbf8fd6b5df388 SHA-256: 8a59ded4728a36101e5c39ab0928ed08d82cc212d939490fd2ce41f703dd0d47
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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
  • 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://zajinet.ru/strik?utm_term=why+won%2527t.the+door+unlock+on+my+hotpoint+washing+machine PDF link annotation
    • http://niluwipewuxasa.medianewsonline.com/figozumofiw.pdfIn PDF document text
    • https://tijawuxegolizad.weebly.com/uploads/1/3/4/5/134597381/8125530.pdfIn PDF document text
    • https://cdn.sqhk.co/xesozugis/eKjh0If/pottery_barn_christmas_stockings_personalized.pdfIn PDF document text
    • https://pedumodab.weebly.com/uploads/1/3/1/6/131637036/volaxog_radarogaz.pdfIn PDF document text
    • http://changepass.online/how_to_become_a_reiki_master_for_freecp4q7.pdfIn PDF document text
    • http://helplnstagramcontact5087423.com/deep_nutrition_audiobookp7syc.pdfIn PDF document text
    • http://copyright-services-us.com/24442983732k9n1w.pdfIn PDF document text
    • http://tulomodev.getenjoyment.net/84340808163.pdfIn PDF document text
    • http://9gusevshop.space/duzetabixakaluwekunanowe6xr6.pdfIn PDF document text
    • https://jazigibebegada.weebly.com/uploads/1/3/1/6/131606339/5435609.pdfIn PDF document text
    • http://vomimaforotagi.mywebcommunity.org/54217372923.pdfIn PDF document text
    • https://ronunafo.weebly.com/uploads/1/3/1/8/131856498/81d680e018b.pdfIn PDF document text
    • https://cdn.sqhk.co/vinasujitupe/h1gVhdG/road_rash_3d_review.pdfIn PDF document text
    • https://liziwozubol.weebly.com/uploads/1/3/4/8/134851467/ratikevuwexe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/88b46807-6b68-48fe-bbc7-89a920726f1b/70965044291.pdfIn PDF document text
    • http://nabulegewuwal.myartsonline.com/geometria_angulos_ejercicios.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e94b42c2-75d5-4fb9-a505-ac31955f646f/platicas_bautizo_chihuahua.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/31e687ed-0d97-402a-8e06-2d6f94560a2a/xojelexexusa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6b46f7e8-4c13-490c-bf0b-8cbeb422d843/jedini.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bcf19d9e-3f94-4bc5-8334-a8d48bce676d/dell_ax510_sound_bar_specs.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_off0000ecae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECAE 5824 bytes
SHA-256: 95263978b80b2e07ec0cf14f18d9786b5cdef4e36155f12701174ef58d2be4f0
font_01_sfnt_off00010087.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10087 10824 bytes
SHA-256: 3d0e653eaf4a257227cc9455e3d01f00d6c75a00ca0feb23aedafce81aedeaa9

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