Malicious PDF — malware analysis report

Static analysis result for SHA-256 3042b92e503522de…

MALICIOUS

PDF

80.4 KB Created: 2021-02-23 00:53:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 5fa0e8e5209c71aaf678684ad3e32c43 SHA-1: df9345f141557ae619f32a7c505e8a611b467b2b SHA-256: 3042b92e503522decb3d71873a6253bc5427fc71c833910ce9b234485d5f9708
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains and services like Weebly, indicative of a link farm designed to obscure the final destination. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this is a malicious tactic. ClamAV detection and ML classification further confirm its malicious nature, likely serving as a phishing lure or a downloader for further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://bologen.ru/strik?utm_term=comparing+apples+to+oranges+origin PDF link annotation
    • https://mopokelam.weebly.com/uploads/1/3/5/3/135349304/d0250d58add.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366042/normal_5fee4afbb0c09.pdfIn PDF document text
    • http://se-mrush.com/tamil_movies_hd_tamilrockersd1yus.pdfIn PDF document text
    • https://rutenavujom.weebly.com/uploads/1/3/0/8/130814208/somut.pdfIn PDF document text
    • https://vowemiwa.weebly.com/uploads/1/3/5/3/135392560/rivunevipapaza_xojopekig_juforenut_galevusa.pdfIn PDF document text
    • http://penerete.66ghz.com/90822872714.pdfIn PDF document text
    • http://wuvolubevozobo.iblogger.org/34117110482.pdfIn PDF document text
    • http://kasuxifuk.iblogger.org/marvel_movies_on_disney_plus_at_launch.pdfIn PDF document text
    • https://cdn.sqhk.co/fuvazuginu/Yhhgdw3/hooked_chat_stories_mod_apk_unlimited_hoots.pdfIn PDF document text
    • https://nafeziwubiwodi.weebly.com/uploads/1/3/1/3/131379183/kubesomudiwaxeju.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bilexijo.rf.gd/80312818315.pdfIn PDF document text
    • http://kawobos.rf.gd/modelo_canvas_lienzo.pdfIn 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
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e2fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2FD 3280 bytes
SHA-256: a460ab0dc044b7655e49eac0b664b9b289e1e31786134450c72e44162588e256
font_01_sfnt_off0000eeb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEB7 5044 bytes
SHA-256: b380c0901c5e00da0304055fbf4749e32984905159da616e563c0497643984b8
font_02_sfnt_off0000ffbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFBC 3720 bytes
SHA-256: d0c9e33916e9e64e42e31bcf0d345f6c2fcd41735b1a34df0119bd0eb1094281
font_03_sfnt_off00010b20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B20 13572 bytes
SHA-256: 713c34bdd63729d8ce9438f104b329ba0a245eaa160042844e69019656a65a63

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