Malicious PDF — malware analysis report

Static analysis result for SHA-256 3bc41d227ce8f798…

MALICIOUS

PDF

78.0 KB Created: 2021-03-23 20:53:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3986ab671ba58e19ce5f5f863408e232 SHA-1: 7e999ba6338f7cc4539295b66a0cdb9ec80cc110 SHA-256: 3bc41d227ce8f798f0a2142c92e1b062c5a636701725080ac21cba0effd5db85
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 hosting, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for distributing further payloads or redirecting to phishing sites. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a malicious document, potentially leveraging embedded JavaScript for malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://nipisod.ru/wix?keyword=logarithmic+inequalities+worksheet+kuta
    • http://fawejidiribap.22web.org/buddhist_philosophy_essential_readings.pdf
    • http://guparob.mywebcommunity.org/sinus_rinse_instructions.pdf
    • http://sexapixir.22web.org/facebook_album_photos.pdf
    • https://cdn.sqhk.co/fakosopalo/hdqNCam/kunuberivexetitawi.pdf
    • http://betizekaxu.getenjoyment.net/wabegejafujimogorud.pdf
    • https://cdn.sqhk.co/nexasolonit/gyhbFDh/hydraulic_cylinder_design_calculations.pdf
    • http://zuvalasit.mypressonline.com/59691668000.pdf
    • https://cdn.sqhk.co/pijajawopoji/ubbchgW/play_online_bike_racing_games_free_without_downloading.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://2a4065d7-883d-43e8-a524-7ce9aa4b4e88.filesusr.com/ugd/ccb1c6_0832079614cc4f7e862cff7281dfe0db.pdf?index=true
    • https://uploads.strikinglycdn.com/files/963e785f-4f2b-4901-b609-8db540377231/remington_550-1_parts_ebay.pdf
    • https://923a8ca3-316b-4844-b38f-9bc955ad4852.filesusr.com/ugd/312e0e_6ee795acb23343f8b219a3eb01b166fc.pdf?index=true
    • http://gemovimuwopete.atwebpages.com/56582077014.pdf
    • https://uploads.strikinglycdn.com/files/7b8d5162-db5a-432a-9b3d-934f36fcb2a5/how_to_read_the_stock_market_charts_in_the_newspaper.pdf
    • https://uploads.strikinglycdn.com/files/6f28cf06-6fcb-428e-843c-b3a79bd61c7b/dunkin_donuts_medium_caramel_iced_coffee_with_cream_calories.pdf
    • https://3e1af3dc-cf37-4f58-935d-0a6065bc5ce9.filesusr.com/ugd/3ca236_9af1e3424d86467aa147ceded5a0b638.pdf?index=true
    • http://sajulugebimisu.myartsonline.com/36760978897.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da9d.bin
0e8012f0b40f492059c4c53788f93de1d2d7d335b256155703d7610e92e2171e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDA9D 5436 bytes
font_01_sfnt_off0000ed0b.bin
2ff467cd28fe9fa5a77416c1d77a1fdf48de5853b66a4b6a6abddb4eb8101829		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED0B 11616 bytes
font_02_sfnt_off000114f3.bin
5d98436f6b5de25b1d6eb7d4a603f92c10d56ab3c848ca3ea644cf3d783849bd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x114F3 16276 bytes

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