Malicious PDF — malware analysis report

Static analysis result for SHA-256 7603d4c9c8a3119b…

MALICIOUS

PDF

105.5 KB Created: 2021-04-21 08:40:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: c2caec3189572311479b4f1cff6e0415 SHA-1: 13b4a6917a94935286e8e70f376a15e781a83b1c SHA-256: 7603d4c9c8a3119b58b0cbe36d5753c25be37ef92067af8928f6cc480062c5b7
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 a heuristic identified it as a link farm. The document body, though heavily obfuscated, contains a search query that likely serves as a lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery.

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://mezovuduw.ru/strik?utm_term=is+there+a+reset+button+on+a+samsung+refrigerator PDF link annotation
    • http://themarkuzmusic.com/88232876097dyryg.pdfIn PDF document text
    • http://haustova.com/181497489584w4vu.pdfIn PDF document text
    • http://1-bog.ru/fuxavusozejufagoxaduxaule1.pdfIn PDF document text
    • https://pajuxosam.weebly.com/uploads/1/3/0/9/130968950/b19ff1d8.pdfIn PDF document text
    • http://triple-doska6.club/17045884880802i7.pdfIn PDF document text
    • https://vovowiki.weebly.com/uploads/1/3/2/3/132303124/814b73827d.pdfIn PDF document text
    • https://muxetomanudone.weebly.com/uploads/1/3/1/4/131406273/gijolixotomoxasir.pdfIn PDF document text
    • http://openchambre.xyz/yamaha_yas-203_subwoofer_pairingjwb9k.pdfIn PDF document text
    • http://my-favshoph.online/wolizutowuvw099.pdfIn PDF document text
    • http://7gusevshop.website/laney_supergroup_schematicde626.pdfIn PDF document text
    • https://cdn.sqhk.co/zuzipogowita/jiisbUC/6510407056.pdfIn PDF document text
    • https://cdn.sqhk.co/bamikalagov/cFNjfOR/word_r_wallpaper_for_android.pdfIn PDF document text
    • http://infonewstravel.com/the_water_is_wide_james_taylornz13g.pdfIn PDF document text
    • http://superheatbelt.xyz/what_is_the_best_emergency_food_to_buyv9lme.pdfIn PDF document text
    • http://artyom.guru/273508926481w1cw.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://radumepetunonif.rf.gd/dubifokubelosexonuj.pdfIn PDF document text
    • http://fodiragotisaka.epizy.com/trinidadian_teacher_killed_girl_in_jamaica.pdfIn PDF document text
    • http://genufewewirim.rf.gd/selesujogodus.pdfIn PDF document text
    • http://falogivaxaf.epizy.com/beers_list_2020.pdfIn PDF document text
    • http://lanobifojedepa.epizy.com/wesobidudogexidalojoneg.pdfIn PDF document text
    • http://tipixerokofor.epizy.com/66311052723.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001457a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1457A 5228 bytes
SHA-256: 199a3052f43de08994f37921fba306ab5a3cf80d751a62fb14dab5f83544402f
font_01_sfnt_off0001571b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1571B 12256 bytes
SHA-256: 780339e48f41025c10498adb8cd21b8bd7dbe3b5fb1087189e02f32d6afb63a4
font_02_sfnt_off000180e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x180E7 16140 bytes
SHA-256: 159427b32ed66bfbde86def5e6c2992bde67dfb25400c4000a37c9b59b949b61

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