Malicious PDF — malware analysis report

Static analysis result for SHA-256 f19121562fcde9db…

MALICIOUS

PDF

83.0 KB Created: 2021-04-11 10:44:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 28bdb06772f9778d48aacbbf9443c66d SHA-1: 7f0461f90eb3acc86a96e9443fd1402b685c4eb5 SHA-256: f19121562fcde9db2b7da2fb6d4c5c578a73bb5fe11253a4875a3ffc07b71b32
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to disposable domains, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with common phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://nipisod.ru/strik?utm_term=how+to+fix+an+unbalanced+top+loading+washing+machine
    • http://smartbright.club/tepumojevudilipu585ye.pdf
    • http://worldthailand.fun/biwonefaneligeforigiled25hv.pdf
    • http://gratoraama.space/how_to_activate_a_furnace_in_minecraftdu3bn.pdf
    • http://mebel-albero.ru/29207617210a20nz.pdf
    • http://organicnu.info/62608342428k2sga.pdf
    • https://tidopotixasajev.weebly.com/uploads/1/3/0/7/130738881/wijijo_vemowifimifa_kukaregipe_xozoxofowo.pdf
    • http://opensol.xyz/12954519499pg568.pdf
    • https://kinajerabisar.weebly.com/uploads/1/3/4/7/134748515/4ca542e7343e.pdf
    • http://instofficial.online/cissp_all-in-one_exam_guide_7th_edition1piue.pdf
    • http://antonioit.space/84732590398sht7u.pdf
    • http://baby-slings.ru/nugifuweridowanazubekorex281i0.pdf
    • http://esagafow.fun/76165452944rrjx2.pdf
    • http://bioforce-co.site/how_to_write_a_good_story_for_beginnersm6g5h.pdf
    • http://gatorama.site/793711323041epdt.pdf
    • http://select-get.top/jabolamivotijokeduwex3azw.pdf
    • http://lazadacostumercenter.com/798109001693jjxu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://biguvuxurezuto.epizy.com/gifasigatofanir.pdf
    • http://wasidaf.epizy.com/5_point_anxiety_scale.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f530.bin
6f0fe65ee55d44f0518be090c59e5bde197f4646c2b112aa0a5d02e8866cb0e3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF530 5616 bytes
font_01_sfnt_off0001082e.bin
06aca60e64b1945d3bc975f32bd8a7842c64c9dde82b9b5fdcd57c49fccaa431		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1082E 11744 bytes
font_02_sfnt_off00012e4a.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12E4A 4324 bytes

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