Malicious PDF — malware analysis report

Static analysis result for SHA-256 d34150659501e9bf…

MALICIOUS

PDF

79.8 KB Created: 2021-04-30 23:35:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: de1d9ba328a58bfc5c0ddd2c3f0dca76 SHA-1: c46b583084bfb759ce47a626507a36109a76def9 SHA-256: d34150659501e9bf99430776a001336691149edfe5c83dc93c0ef16a4e891682
136 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including ML and ClamAV, as malicious phishing content. It contains an embedded URL that redirects to a suspicious domain, likely serving as a lure for a phishing attack. The document body, though heavily obfuscated, appears to be a garbled attempt at presenting content related to heater reviews, which is inconsistent with the malicious URL.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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://nipisod.ru/strik?utm_term=best+oil+filled+radiator+heater+reviews PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4479933/normal_600cc91ef054a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455907/normal_5feb4e1ce254a.pdfIn PDF document text
    • http://nejupike.mygamesonline.org/learning_to_write_arabic_letters.pdfIn PDF document text
    • http://jerimujolegem.medianewsonline.com/5767787723.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381302/normal_5fc66e6063ce2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425255/normal_5ffd0aeaa9c1b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383566/normal_60220a2d49187.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455881/normal_601fd8f1a4980.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369306/normal_602a8b254b68d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447649/normal_6060d53303d8e.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/03471d59-372a-4cb8-a905-bf324c6d4eac/procedimiento_para_la_recoleccion_de_datos_en_una_investigacion_cualitativa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/81ef3417-d10a-4b23-8c4c-fb7d665cec1b/optimate_4_battery_charger_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e0ed7a00-120d-4c34-bff1-9368039b12c2/69253932310.pdfIn PDF document text
    • http://nixomirorubu.myartsonline.com/18957168310.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/af615819-3d9d-4a6e-9ec1-7d4e0bfebca8/zilitejaxesesaduda.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a9f67fba-3a40-4907-b190-34eaa0fd8fec/how_to_draw_comics_step_by_step_easy.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1b8026e6-3b17-4e1c-84f0-70c795800a8e/percy_jackson_hindi_dubbed_300mb_movie_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/27894f2e-9699-4e6c-8c58-e2caeeadc2b2/89783106664.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5b4ab160-5e64-40df-b1fe-5de00435cb79/diresujeru.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3bebaca4-9e7d-4e37-a05f-3fab99150da4/rerixu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3aef3189-0fb2-48d6-904d-0ddeef6b4a4a/jamavexenirezoko.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3bbb0bdc-2e83-404c-be50-55ccc11c0818/how_to_clean_st_croix_pellet_stove.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_off0000f835.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF835 5196 bytes
SHA-256: 4ecc4fac4fe1382855e2f60d67dcc8b81e3802c50dc88b7556fec190d07983be
font_01_sfnt_off000109f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109F1 11144 bytes
SHA-256: 5ab03e97b4a2714643cdb9fd3af86cce9903adfe54f73ba1d6f064817a2af187