Malicious PDF — malware analysis report

Static analysis result for SHA-256 d91518b860d38c9b…

MALICIOUS

PDF

68.8 KB Created: 2021-02-23 19:44:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 047f0a8187957a0a3a6b25f5d005aa4e SHA-1: 243d4fcf1bfa82345383f15d681b44b90947d279 SHA-256: d91518b860d38c9bb5148a79b7e7eed60c9b498911a3d4449e264e872061afce
166 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains multiple suspicious and invisible links pointing to domains that host other PDF files, suggesting a phishing or malware distribution scheme. The presence of embedded URLs and the PDF_SUSPICIOUS_LINK_LURE heuristic indicate an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-heavy PDF with invisible link to suspicious domain high PDF_SUSPICIOUS_LINK_LURE
    PDF is a small image-heavy lure with invisible link annotations that send the user to a suspicious high-risk-domain URI. This matches credential-phishing carriers where the visible document is only a prompt and the real collection flow happens on the linked website.
  • 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://leonvi.ru/wix?keyword=hecate+macbeth+monologue PDF link annotation
    • http://idealicaitalia-official.site/mh_cet_admit_card_2019_websiteaoqqv.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486350/normal_5fdf1be131c27.pdfIn PDF document text
    • http://btsworld.org/12552729007r5qz4.pdfIn PDF document text
    • https://cdn.sqhk.co/xagunetoxa/ji2jjih/cafe_racer_seat_removable_cowl.pdfIn PDF document text
    • http://guxiket.iblogger.org/43174247453.pdfIn PDF document text
    • http://shopwithsale.website/94954576947gy2vr.pdfIn PDF document text
    • http://registrat.space/49120738490362qm.pdfIn PDF document text
    • http://zdorovie-vashe-vse.xyz/abrg_des_marchs_financiers_201936cqq.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403823/normal_60055df1e45b9.pdfIn PDF document text
    • http://com-login8.xyz/lojidiforud5st9.pdfIn PDF document text
    • http://gravkamen.ru/princess_and_the_frog_castlev0ds4.pdfIn PDF document text
    • http://thesalle.xyz/suzuki_sidekick_engine_specsi46z1.pdfIn PDF document text
    • http://construt.site/677470546097sjxi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473041/normal_603527957131c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480758/normal_6014612ee027c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000d1c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1C0 5040 bytes
SHA-256: f361ec9dc62a3b92a71f335a7e2551f06a7fbf9f260bb29cdd26a94cca682129
font_01_sfnt_off0000e2c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2C0 10584 bytes
SHA-256: 414c09c15ea75cbe9e4809e91998a7da2db723e6de66d89667c4734b004f3ccc

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