Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d5239db2f6005d9…

MALICIOUS

PDF

72.0 KB Created: 2021-03-15 14:33:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 348a2e2bc09e0016d1514573e29825c0 SHA-1: 24704b304f6ff2d84693de89353094cccce1652d SHA-256: 0d5239db2f6005d98beb904cc6a83d3b7bce356340bab61e05ed61b4c1d31e9d
164 Risk Score

Malware Insights

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

The sample is a PDF file identified as malicious by multiple heuristics, including a critical PDF_SEO_LINK_FARM firing. This indicates the PDF contains a large number of external links, likely to facilitate a phishing or malware distribution campaign. The presence of embedded URLs and the ML classifier's high confidence score further support its malicious nature. The document body, though heavily truncated, contains keywords related to 'pocket primary care pdf free' and the authoring application 'wkhtmltopdf', suggesting a lure for potentially sensitive information or a disguised malicious download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • 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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://lozipotod.ru/wix?keyword=pocket+primary+care+pdf+free
    • https://kokexofagisukop.weebly.com/uploads/1/3/2/7/132710589/7318628.pdf
    • http://meetcabinets.xyz/8980331277rc1pa.pdf
    • http://goossyy.online/how_do_you_fix_a_keurig_that_wont_brewjgbak.pdf
    • https://suzazega.weebly.com/uploads/1/3/4/4/134476369/rezes.pdf
    • https://xexigajusotojuz.weebly.com/uploads/1/3/1/6/131606060/moluzuka.pdf
    • http://sanatoriy-izumrudny.ru/hardest_sat_math_problemsk9jqh.pdf
    • https://duxoberadu.weebly.com/uploads/1/3/4/7/134718286/1761774.pdf
    • https://vajugape.weebly.com/uploads/1/3/4/7/134767319/36c16f.pdf
    • https://piwoviwilo.weebly.com/uploads/1/3/4/3/134386066/7c3625.pdf
    • https://cdn.sqhk.co/gitogozune/fOhaijU/48142350420.pdf
    • https://cdn.sqhk.co/mirusopujame/idimieI/physics_toolbox_sensor_suite_pro.pdf
    • https://wipasajumavadus.weebly.com/uploads/1/3/4/7/134775966/sakonakomuzo.pdf
    • http://ellmax-site.xyz/update_my_garmin_nuvi_255w_for_freeb1j3w.pdf
    • https://cdn.sqhk.co/kelopifagisu/gividgi/gorizajelijemokegotejuven.pdf
    • https://gozerezujokosas.weebly.com/uploads/1/3/4/8/134856803/3677416.pdf
    • http://passive-income.ru/dofojuzadilawarage2ep2g.pdf
    • https://cdn.sqhk.co/temazajilib/rhjhfid/71869901505.pdf
    • http://marketes.pro/18718493806kecpb.pdf
    • http://clipshd.design/smart_extreme_and_restricted_utilitarianism_summary6k0zx.pdf
    • http://xeeewq.xyz/dozuwagavosazakobakevis2r0wc.pdf
    • https://cdn.sqhk.co/zezetemirag/cMjihjF/zojopalati.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/82a878b3-fb27-4dae-a0ce-88f022ffb295/53139720038.pdf
    • https://uploads.strikinglycdn.com/files/898de4c0-0ee0-4923-afc3-3ac54fc1e0f8/71213029459.pdf
    • https://uploads.strikinglycdn.com/files/84f0c8f0-725b-4c21-bec4-fdb5e9b56698/strength_in_what_remains_quotes.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_off0000dad2.bin
aa5f40626568a153bffe977a64551372526deb02c40ddf9e1e2a396832dd1917		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDAD2 5256 bytes
font_01_sfnt_off0000ecaf.bin
e51e2d84047b5aa93117a6a3a9d8e44f0a54db563305ae640cb76b04d47329fe		 pdf-font-stream PDF embedded font (sfnt) at offset 0xECAF 10660 bytes

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