Malicious PDF — malware analysis report

Static analysis result for SHA-256 ecd6af80b18448c8…

MALICIOUS

PDF

80.0 KB Created: 2021-04-07 04:11:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 50156f072d8ec7638141980faa1ff7db SHA-1: d46d8b7222ac9d5130df8ff6d7300c4fecaa36cf SHA-256: ecd6af80b18448c8633c6951ae60a034b13444ffa7d61259c73186991794d773
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which are suspicious and likely lead to malicious content or phishing sites. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan. The embedded links suggest an attempt to redirect the user to potentially harmful websites, possibly for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://pelibifir.ru/wix?keyword=csun+2020+conference+venue
    • http://reetodo.online/army_dispatch_procedures_powerpoint1q6aw.pdf
    • https://cdn.sqhk.co/kikepedu/gYifgjv/voucher_game_telkomsel_gamesmax.pdf
    • https://cdn-cms.f-static.net/uploads/4461751/normal_6044df944724f.pdf
    • https://cdn.sqhk.co/bitaxukezor/Vii7zxa/zombeast_survival_zombie_shooter_mod_apk_download.pdf
    • https://cdn-cms.f-static.net/uploads/4380858/normal_605129dabb289.pdf
    • https://cdn-cms.f-static.net/uploads/4368237/normal_606a32c24bd1b.pdf
    • https://cdn.sqhk.co/lebexuzo/WLFihjg/smashy_city_monster_rampage_apk.pdf
    • http://gasolotiravizid.sportsontheweb.net/xizijezijevug.pdf
    • https://cdn-cms.f-static.net/uploads/4413345/normal_601d2290906eb.pdf
    • https://cdn.sqhk.co/vilitemeru/jdggAWm/garden_fruit_legend_apk.pdf
    • http://fruit-italy.space/namavukh2a2.pdf
    • https://static.s123-cdn-static.com/uploads/4391024/normal_60028a6f1fe5d.pdf
    • https://static.s123-cdn-static.com/uploads/4481059/normal_5fff3ff60e79f.pdf
    • https://static.s123-cdn-static.com/uploads/4496216/normal_600654e3aacb2.pdf
    • http://zotikarida.medianewsonline.com/what_is_relationship_between_mean_median_and_mode.pdf
    • https://cdn.sqhk.co/josedinis/Pajgij0/axe_climber_hack_apk.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://2dcb0092-dd22-4cef-90c1-8c398f802bb7.filesusr.com/ugd/ff3115_311b8626656e4bcbb32a5dc42d5a694e.pdf?index=true
    • https://f7690f66-1871-4559-97e0-239dee5b15da.filesusr.com/ugd/d2cc1f_c85cc2ec53584a0089fc93fc523d89d3.pdf?index=true
    • https://e1eccfe9-8888-4f52-a155-e9c8e84e0752.filesusr.com/ugd/4fb05f_c1bdfb40dcaf44d2add7a7fcdbee1e98.pdf?index=true
    • https://df1882fa-13c5-42f1-8438-577935b594b9.filesusr.com/ugd/91932b_a7f1a429288042f592e2b4dda3c3a1b1.pdf?index=true
    • http://gagugitebuf.atwebpages.com/como_inserir_assinatura_digital_em.pdf
    • https://9e2901ea-5d25-41a5-867c-54d0774c6e48.filesusr.com/ugd/4d0f37_91d60b8a36694c6d8e2715fdc712d028.pdf?index=true
    • 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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e62d.bin
761a38ec484d1e3f3519eda48d0e3cc8b7bc9a8646baec5741c17ffb23b8f4a8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE62D 4872 bytes
font_01_sfnt_off0000f6df.bin
c2bb1dcf61816a72be3f1d6c11a8627611f6e5c925e0b930c6d04105711b4888		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF6DF 11380 bytes
font_02_sfnt_off00011d4d.bin
f469c5aa689aa4c1965481b78cfaebbf1c3ebdad2306c7067134b7b4aaa0addd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11D4D 16164 bytes

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