Malicious PDF — malware analysis report

Static analysis result for SHA-256 bcf83eeec5797ce0…

MALICIOUS

PDF

71.3 KB Created: 2021-04-10 07:30:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8408094394ef9c74f63db54178ae4a92 SHA-1: 17a603e5b7f86472b26d25a46704f0e546c92941 SHA-256: bcf83eeec5797ce021e1c30a189776c26cf9d40333f6ee8b71a6056edeb64825
126 Risk Score

Malware Insights

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

The sample is a PDF file flagged by multiple heuristics, including ML and ClamAV, as malicious and phishing-related. It contains a large number of embedded URLs, many pointing to disposable domains, suggesting a link farm or phishing lure. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically indicates a non-clustered link farm on disposable hosting, and the presence of 'utm_term' parameters suggests tracking or redirection for malicious purposes. No scripts were extracted, but the overall structure and URL distribution strongly indicate a phishing or malware distribution attempt.

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
  • 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://jumiwimov.ru/strik?utm_term=what+rejected+vital+force+theory
    • http://melidagerukebel.sportsontheweb.net/31145740330.pdf
    • http://lisolu.org/organizational_communication_zarembaxridc.pdf
    • https://cdn.sqhk.co/fegukajebaj/jicUvgh/guitar_rock_and_roll_riffs.pdf
    • https://cdn-cms.f-static.net/uploads/4465543/normal_603345a80c0e2.pdf
    • http://nenodipemuxok.mypressonline.com/all_diary_of_a_wimpy_kid_books_2019.pdf
    • https://cdn-cms.f-static.net/uploads/4366984/normal_600ec126a9d91.pdf
    • http://govnososal.xyz/we_should_help_anisse_and_bertholdtybtf.pdf
    • https://static.s123-cdn-static.com/uploads/4375541/normal_5feb40654b19b.pdf
    • https://tilemutafadat.weebly.com/uploads/1/3/1/8/131856023/7665085.pdf
    • https://cdn.sqhk.co/kitujesijak/gdigm4O/duwedaniji.pdf
    • https://nakaporona.weebly.com/uploads/1/3/1/4/131438848/81d0c12ef82e1.pdf
    • https://jeripakituwimug.weebly.com/uploads/1/3/2/6/132695489/fudugux_bedan.pdf
    • http://tilosag.mypressonline.com/today_dinamalar_tamil_news_paper_free_download.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/navoburarovada/rerufututitituvijopu.pdf
    • https://s3.amazonaws.com/sepovutapakogaf/the_taming_of_the_shrew_character_chart.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_off0000db83.bin
c49387ea0e9336c4ba37e89235657ee560c976812ece988356659d7c97619032		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDB83 5184 bytes
font_01_sfnt_off0000ed3e.bin
fe627b3df083f11d2fe844cf0e71bb62bce2e368dbf2ab82293f2057cebdf694		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED3E 10496 bytes

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