Malicious PDF — malware analysis report

Static analysis result for SHA-256 61c4f8b62259adbd…

MALICIOUS

PDF

82.0 KB Created: 2021-03-15 07:42:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f690d0c310fb278026c6321d7ad134aa SHA-1: e2db831125c5cc7ec227eadd2d73f9559fdd8bc0 SHA-256: 61c4f8b62259adbd5969d96a864c2ea63b16b31af228804f7f9cdf0818e7ece2
126 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs, with at least one pointing to a suspicious domain ('bologen.ru') that is likely used for phishing or malware distribution. The PDF structure and the presence of external URIs suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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/award?keyword=aggregate+demand+and+aggregate+supply+notes+pdf
    • http://xubanapirobula.mypressonline.com/10286860723.pdf
    • http://gosunenibunale.getenjoyment.net/taxujawux.pdf
    • http://dumubemajizukov.medianewsonline.com/jerafu.pdf
    • http://melowew.scienceontheweb.net/livebitimagetexinomojusek.pdf
    • http://lebuvowune.getenjoyment.net/plan_center_parcs_lac_d_ailette.pdf
    • http://kovatafob.mypressonline.com/41957303489.pdf
    • http://bawazofo.getenjoyment.net/3180250667.pdf
    • http://siwupojotuj.getenjoyment.net/chapter_11_apush.pdf
    • http://mewebewenuzotez.iblogger.org/muriduwowixesadati.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://94db4134-5784-44c5-a63d-963e509970fa.filesusr.com/ugd/9c58c5_f39072dc836c4c6bb77fd6e204d8e763.pdf?index=true
    • https://5ccda086-29c7-4024-8a93-689df1f3b89c.filesusr.com/ugd/ed8107_8c27e9443ac844ec9b8b1d680b76ba67.pdf?index=true
    • https://ed59cdd8-0d75-4634-8bb2-7afdb9da103e.filesusr.com/ugd/9cb112_b5434935e1f14b82a2fc1b1c335ae842.pdf?index=true
    • https://19a39513-20cc-49d1-a75c-e30ce0314142.filesusr.com/ugd/f99735_32f5b1757de34c34a74a53de92ea0f7a.pdf?index=true
    • https://s3.amazonaws.com/dubiditiginowo/buku_belajar_membaca_untuk_tk.pdf
    • https://43e3b293-20b6-4b74-9f7d-0eefffb4d2df.filesusr.com/ugd/11595e_a26295fa702e4742a9bf7eabc77a03f2.pdf?index=true
    • https://s3.amazonaws.com/sosupejuxofedo/47015757905.pdf
    • https://s3.amazonaws.com/febopa/undertale_annoying_dog_sheet_music.pdf
    • http://vimomata.rf.gd/casablanca_guitar_tab.pdf
    • https://6f465708-eb37-4ee2-8658-ebeec6cd93ea.filesusr.com/ugd/4bb103_19f882002ae6466091f666906817a31e.pdf?index=true
    • https://cc968bdf-8a18-4a65-a72d-893c706ef441.filesusr.com/ugd/bae363_24c67cfff0ed460fabfbc283c5def62b.pdf?index=true
    • http://padegijogul.atwebpages.com/suninulupewelekaxefizoka.pdf
    • https://3ff4c494-4984-418a-b709-7a5c611cca0a.filesusr.com/ugd/adbee0_01fc4a2bd42e4aa3a1a38440f0849e66.pdf?index=true
    • https://788ae96d-7a4f-4726-91a9-07bb742fb3e7.filesusr.com/ugd/97aff7_4bd5c7e5cbc0487080ae0b3349a2f184.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000101e6.bin
05b82a7fbd89c482b573c68874c1edbe94708460e530d585a7bfd340fe311e64		 pdf-font-stream PDF embedded font (sfnt) at offset 0x101E6 5452 bytes
font_01_sfnt_off00011466.bin
88d4ecf00ccc0852255acea9424e13cfdc3cd3ae61563f594a2c93a761c1b856		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11466 10580 bytes

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