Malicious PDF — malware analysis report

Static analysis result for SHA-256 14a20b28ef27377c…

MALICIOUS

PDF

73.9 KB Created: 2021-06-10 08:31:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fe401bc986dd56094380e11bb6e07285 SHA-1: dec0df0545a634bfdb9723b0f52da5d199cddb30 SHA-256: 14a20b28ef27377cd28041d882fb68fa122edb323d7022b41e8a00ac561ed010
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF file contains multiple embedded URLs, with a primary focus on directing users to 'irlanc.ru' and 'zixavuxo.weebly.com' under the guise of providing FRP Google Account APKs. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. The presence of external URI heuristics and link farm detection further supports a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://irlanc.ru/pbw?utm_term=frp+google+account+apk
    • https://zixavuxo.weebly.com/uploads/1/3/1/3/131398386/1416036.pdf
    • https://wifusudufasebo.weebly.com/uploads/1/3/5/9/135992472/sozazitiva.pdf
    • https://gobumireg.weebly.com/uploads/1/3/1/3/131383916/xoxipa_bisosajidige.pdf
    • https://bazubipevudupu.weebly.com/uploads/1/3/4/8/134876407/fusudadonomoti.pdf
    • https://wawukonuxoni.weebly.com/uploads/1/3/4/0/134095992/judagijovotewudevu.pdf
    • https://vomuzubedabop.weebly.com/uploads/1/3/0/9/130969103/fe360ca1.pdf
    • https://vuvuzuvikedatun.weebly.com/uploads/1/3/4/5/134529562/bolefijumibarebaw.pdf
    • https://vinifobak.weebly.com/uploads/1/3/5/2/135298549/dewawu_xuwov_womixujosawibag_woxadi.pdf
    • https://xixivejeb.weebly.com/uploads/1/3/4/6/134603549/8088417.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/1f545ca2-3d6f-4f53-a883-de8ffedfacd9/market_wizards_book_review.pdf
    • https://uploads.strikinglycdn.com/files/cf86878c-a396-4b05-beb8-ab4f659dfd67/72148912405.pdf
    • http://lekadebixe.pbworks.com/f/41960944104.pdf
    • http://gurilotav.pbworks.com/w/file/fetch/144823758/how_to_switch_google_to_dark_mode_pc.pdf
    • https://uploads.strikinglycdn.com/files/794d963f-a056-40a2-b10e-36b1c2e1c002/5390472032.pdf
    • http://ziduzobif.pbworks.com/f/harry_potter_and_the_order_of_the_phoenix_pc_game_review.pdf
    • http://bojifimaral.pbworks.com/f/bulunevuvet.pdf
    • https://uploads.strikinglycdn.com/files/71d57db4-e0f6-4109-9c91-f23d24b1dc3d/zabodamepu.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e3c6.bin
02fe79ea1d7bc99ec1a08f186ec1c081e10d4b21bd410f11feacbde89a88e76e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE3C6 4940 bytes
font_01_sfnt_off0000f4b0.bin
3889ee51bc78bacf8d0129e88cc898b1234c5249818631e7bf240995bba676ff		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF4B0 10644 bytes

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