Malicious PDF — malware analysis report

Static analysis result for SHA-256 b07fef5f2ec880d6…

MALICIOUS

PDF

78.4 KB Created: 2021-06-02 02:19:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7cede0b4e43a06c1fc61b39c972ff285 SHA-1: 1a9594e5cc7613cbac93da15495aa384f1c3b54c SHA-256: b07fef5f2ec880d63a83f952d4ef70d38640aa0a0e9f00caa8a74e525eb202c4
126 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many pointing to disposable hosting, and is flagged by ML classifiers and ClamAV as malicious phishing content. The document body, though heavily obfuscated, appears to be a lure related to grammar, aiming to trick users into clicking on the malicious links. No scripts were extracted, but the presence of external URIs and the high ML score indicate a phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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
  • 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://cructi.ru/pbw?utm_term=qual+ea+diferenca+entre+adjunto+adnominal+e+adjunto+adverbial
    • https://static.s123-cdn-static-d.com/uploads/4403816/normal_60b5b551dd1e9.pdf
    • https://cdn-cms.f-static.net/uploads/4388416/normal_6023eab9ba34f.pdf
    • https://zokexeti.weebly.com/uploads/1/3/5/9/135966989/645536.pdf
    • https://cdn-cms.f-static.net/uploads/4463286/normal_6023d270e7b29.pdf
    • https://static.s123-cdn-static.com/uploads/4413705/normal_5fcf6a9d34170.pdf
    • https://xuwajaxupix.weebly.com/uploads/1/3/1/4/131407635/jinib_zurivededuni_dozewojevo_jokimifuputabil.pdf
    • https://xezatitewifesel.weebly.com/uploads/1/3/4/3/134393938/pijosipagisakuxot.pdf
    • https://cdn-cms.f-static.net/uploads/4423780/normal_5fd8f51e4e2e5.pdf
    • https://cdn-cms.f-static.net/uploads/4413575/normal_604f7a12e9cec.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://xuresasadox.pbworks.com/w/file/fetch/144481131/korasutudofen.pdf
    • http://sozakuvepar.pbworks.com/w/file/fetch/144483576/soho_single_turbo_kit_350z.pdf
    • http://sijomirurefi.pbworks.com/w/file/fetch/144478884/rmlau_result_with_marksheet_2011.pdf
    • http://savavaze.pbworks.com/w/file/fetch/144470001/pogil_activities_for_high_school_biology_ecological_relationships_answer_key.pdf
    • http://ravowibosu.pbworks.com/f/what_are_the_7_leadership_styles_forbes.pdf
    • http://gemometis.pbworks.com/w/file/fetch/144483447/samsung_family_hub_refrigerator_width.pdf
    • http://fevosezew.pbworks.com/w/file/fetch/144440712/jean_baudrillard_simulacra_and_simulation_meaning.pdf
    • http://negovijalulu.pbworks.com/f/rowuti.pdf
    • http://ruwomodanom.pbworks.com/f/probability_and_statistics_for_engineers.pdf
    • http://xovelezid.pbworks.com/w/file/fetch/144416310/88470919142.pdf
    • http://jolowajuwijo.pbworks.com/f/xumakid.pdf
    • http://zowonixepor.pbworks.com/f/11304433096.pdf
    • http://jutifakukap.pbworks.com/f/tevawexudizenumomasizirax.pdf
    • http://nigezid.pbworks.com/w/file/fetch/144423738/nagin_dance_nachna_mp3_song_download_bestwap.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_off0000f1ce.bin
486a934335c275d260366d2663acc94b3ca0f4c7d4a816221289c8eedbf6a331		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF1CE 5328 bytes
font_01_sfnt_off000103e8.bin
c699522f55215b7a9062a3a04869760ff15205577f08b58325442364dc7456b6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x103E8 11504 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.