Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd7112280d90b196…

MALICIOUS

PDF

80.0 KB Created: 2021-06-07 19:32:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 800bb71aca354b164158b6343e1bfb03 SHA-1: 4013f6d5cac57107111c62be95685b02aa9f246c SHA-256: cd7112280d90b196594d665fb095d47d7ad98e4637cd7c5c7974e636fc6c85f7
194 Risk Score

Malware Insights

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

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 and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://leonvi.ru/123?utm_term=addition+sheets+grade+1+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4500665/normal_5ffe93980b6d4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385647/normal_604c9de3975b3.pdfIn PDF document text
    • https://sapatipiragibo.weebly.com/uploads/1/3/4/7/134708637/poraxiw-sevijopuwixu.pdfIn PDF document text
    • https://nitowapesapu.weebly.com/uploads/1/3/4/4/134442046/zeregatakoga.pdfIn PDF document text
    • https://nakaporona.weebly.com/uploads/1/3/1/4/131438848/27580220.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402250/normal_602feb3a47f37.pdfIn PDF document text
    • https://ruzuxopamekegi.weebly.com/uploads/1/3/4/7/134748505/5f3a5.pdfIn PDF document text
    • https://jiwazakamofefuf.weebly.com/uploads/1/3/4/0/134041011/lewefiki-jezukekive-zoxukof-gisitegukimobud.pdfIn PDF document text
    • https://bezesigut.weebly.com/uploads/1/3/2/6/132681157/rubodegadowekiz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417817/normal_60bd23d70e137.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370561/normal_603c1c1f6521c.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/69edaff1-9869-4fe0-8dc5-c504e0ad513f/free_online_bubble_shooting_games_to_play_now.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/493c7148-92a8-4e17-9f6a-895ba24cdcf8/how_to_day_trade_for_profit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f80a77b8-1505-40ad-877f-ef986fed84d5/by_the_waters_of_babylon_sheet_music.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cc5a832e-d0ee-4566-bda9-c59a92eedc1c/la_metamorfosis_de_franz_kafka_resumen.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b395650f-e676-4c51-89f5-66a93a0da410/23632052393.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5dbc5deb-850c-4a98-b7a8-e0c45fd0f432/19520766397.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9dfe276b-3379-4da3-8533-c110c288b1af/87433203325.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7e403701-c0b0-443a-9e23-390230f52cdf/pokimexabekezajitedod.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eba7e944-27b9-42ff-9cde-1f553604d65d/1764800671.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_off0000fb6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB6B 5312 bytes
SHA-256: 22e4784aab8b1f4288e34daa94cc297a182bf5831f92c245e3a9c3d521666216
font_01_sfnt_off00010d7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D7B 10956 bytes
SHA-256: 1e78e1d312745da0ad28ccd1e68ec1350d4bd0047af4e5b2cc2653316ee29803