Malicious PDF — malware analysis report

Static analysis result for SHA-256 aea31a72b4deeed1…

MALICIOUS

PDF

83.4 KB Created: 2021-02-28 10:36:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 5d782cf0b2dafa3310e2bc7a5157e596 SHA-1: f19cb7c6e6d4faea2ea86b5d10652c4a84e5ca0a SHA-256: aea31a72b4deeed10b9d983d4c88c2014ad2d5ba886d78c528dcc843b2acfb42
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://dugedepap.ru/wix?keyword=natural+disasters+webquest+high+school PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4495385/normal_5fc88c51378c5.pdfIn PDF document text
    • http://thecabinets.xyz/muvoxagevukisojx5u2i.pdfIn PDF document text
    • https://cdn.sqhk.co/kinanekoxo/eWK5ckM/sonic_adventure_2_battle_ost_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481154/normal_5fdb0d7841b82.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388271/normal_601c9bfc3c116.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379612/normal_602443c464750.pdfIn PDF document text
    • http://bumumapa.mypressonline.com/naziweretu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4496378/normal_5ffcb62817da5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407756/normal_5fcb6e67b4be6.pdfIn PDF document text
    • http://timurberg.ru/6799160159hulef.pdfIn PDF document text
    • https://cdn.sqhk.co/vozeseseber/fheh4gH/98564074090.pdfIn PDF document text
    • http://jenuxijaf.mygamesonline.org/68846240131.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459805/normal_6015c0bf1aca5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424341/normal_601212d60dded.pdfIn PDF document text
    • http://jewlgems.com/pablo_escobar_my_father96ysd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4496225/normal_5fc826247fa45.pdfIn PDF document text
    • http://golden-charm.ru/40178269419zlgkc.pdfIn PDF document text
    • https://cdn.sqhk.co/balekunu/gjhejgd/26107786114.pdfIn PDF document text
    • https://cdn.sqhk.co/wolitobutak/UVv2hXF/free_fire_wallpaper_hd_4k_alok.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tiluxusimutine.atwebpages.com/captain_underpants_and_the_sensational_saga_of_sir_stinks-a-lot_the_twelfth_epic_novel.pdfIn PDF document text
    • http://gipebevu.atwebpages.com/64727914285.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_off000108a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108A5 5528 bytes
SHA-256: d7a148c8c897617d83361f90729f4d358a5c1b6a793db0cce8c621b0f0f07aeb
font_01_sfnt_off00011b71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B71 10640 bytes
SHA-256: aad505418f46c15a502946f5396adc3f7dd364c3f7f64180ec71f74233f5f527

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