Malicious PDF — malware analysis report

Static analysis result for SHA-256 df3dd90758e0ae56…

MALICIOUS

PDF

76.3 KB Created: 2021-03-28 18:53:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8da1eec96002fa4694f6d2c5d7f7401d SHA-1: 2c111f74407ca87554687d6a5c99fe54416e3911 SHA-256: df3dd90758e0ae56f409d69ce458791e59900c6604df83b11b0dd4c936b4ff68
156 Risk Score

Malware Insights

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

The PDF document exhibits characteristics of a link farm, embedding a large number of external URLs, many of which are hosted on disposable domains. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and numerous external links suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://gimoguvi.ru/award?keyword=alcohols+phenols+and+ethers+ncert+solutions+pdf
    • https://niforobufuxir.weebly.com/uploads/1/3/4/5/134512868/revibix.pdf
    • https://bifotuvimutojuz.weebly.com/uploads/1/3/0/9/130969437/386124e59231.pdf
    • https://timakopazasiri.weebly.com/uploads/1/3/4/4/134445807/0b910c615a.pdf
    • https://romugazasemagop.weebly.com/uploads/1/3/4/8/134897733/8816664.pdf
    • https://sapilijufidukuw.weebly.com/uploads/1/3/4/9/134901451/kenefimir-dodew.pdf
    • http://fuvagezilavez.mygamesonline.org/present_simple_and_present_continuous_exercises_with_pictures.pdf
    • https://subopojulolilat.weebly.com/uploads/1/3/4/3/134319837/kujovasugu.pdf
    • http://zinobinipote.22web.org/farazipabosoveg.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/373aad42-d2e6-4944-8755-cd8d65c38e67/dovojidovenebu.pdf
    • http://gagelenobom.epizy.com/camera_blur_background_android_app.pdf
    • https://uploads.strikinglycdn.com/files/ba3cae5b-f7e6-43ac-9ad8-bd7d74cc97e9/arris_sb6121_arris_sb6141.pdf
    • https://uploads.strikinglycdn.com/files/941f0f33-4d90-480e-9a7f-2d09b3cdd308/23157576347.pdf
    • http://ragudoduwe.epizy.com/metal_gear_solid_2_substance.pdf
    • http://gurabagoderes.atwebpages.com/power_book_2_ghost_season_2_cast.pdf
    • https://uploads.strikinglycdn.com/files/99ab4af9-f562-44f6-8f55-da130a33e2ef/43565863738.pdf
    • http://luzoxone.epizy.com/16765334882.pdf
    • 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_off0000ed2c.bin
805e9cafc0c73ff0e4bb0d8b7f6e16e6969df934107dacf1ea381946db476cb3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED2C 5232 bytes
font_01_sfnt_off0000fef0.bin
1d19d7bbad82567194b9049a91a15eaf98fefdb6a3e0501361727dd380f346d9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFEF0 11032 bytes

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