Malicious PDF — malware analysis report

Static analysis result for SHA-256 37ddb63a433b7bbe…

MALICIOUS

PDF

71.4 KB Created: 2021-04-01 13:20:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: c973834739930dd5e97f3a3075d9b72f SHA-1: a79983c8951857d8b8cfd9b13a4a06575270ec0a SHA-256: 37ddb63a433b7bbef9ee02a76272d45bf806d2a2bdc44df5d14429c9fc6096f7
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host numerous links on disposable domains, pointing towards a phishing or spam campaign. The embedded URLs, such as https://mezovuduw.ru/strik, are likely used to redirect users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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=2005+dodge+caravan+sxt+value PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4393179/normal_60648fc84a301.pdfIn PDF document text
    • http://lagulesuko.medianewsonline.com/lumiwu.pdfIn PDF document text
    • https://felelitujafi.weebly.com/uploads/1/3/5/3/135392562/sagorugi.pdfIn PDF document text
    • https://cdn.sqhk.co/pasepizut/Thijejb/is_the_movie_monster_trucks_available_on_netflix.pdfIn PDF document text
    • https://sokasabakowupop.weebly.com/uploads/1/3/4/0/134012989/ritepavojov.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420604/normal_6015d98fe61be.pdfIn PDF document text
    • http://manovina.mypressonline.com/cours_d_anatomie_de_l_abdomen.pdfIn PDF document text
    • http://rusadezebep.mygamesonline.org/psychological_assessment_test.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4503791/normal_5ff9589108c56.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450636/normal_602ad39d7f615.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454543/normal_60651f7c18bba.pdfIn PDF document text
    • https://rasozonikazip.weebly.com/uploads/1/3/4/9/134904665/zewadivujiwitajexeve.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425929/normal_5fe8646676679.pdfIn PDF document text
    • https://cdn.sqhk.co/buzaxelubot/dH6HGAQ/nitenavigoje.pdfIn PDF document text
    • https://cdn.sqhk.co/joxopejufito/4xhfmie/prxjxcts_gostream_share_and_discover_music_studio.pdfIn PDF document text
    • http://xoxuvajes.mywebcommunity.org/72138264374.pdfIn PDF document text
    • https://gifivetusox.weebly.com/uploads/1/3/4/7/134736849/posapelavela.pdfIn PDF document text
    • http://tikopariwoxa.mygamesonline.org/56063320333.pdfIn PDF document text
    • https://cdn.sqhk.co/regavebike/fig4gge/23406082566.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/d888a892-9dc5-4242-936f-695daa361114/pobujepazitofageduwolap.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/366fa574-12e9-46d8-93b1-5134ff9f95d2/el_poder_de_la_vision_myles_munroe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a8cb67e4-11b9-42c3-8e10-b852b0ec34b7/song_of_fire_and_ice_book_6.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA99 5536 bytes
SHA-256: 455e33f969ff62534a3a73785ce5599cfd955d94bbac003d6ad6563dae47c1c8
font_01_sfnt_off0000ed8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED8A 10176 bytes
SHA-256: ee7a5f46098fac85bcacf534156f767ab266eaabff22fd293d570d78031fc115

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