Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f5ad4c3f62a9619…

MALICIOUS

PDF

82.1 KB Created: 2021-03-21 23:43:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 34e821b57a62dce898abe5b61b1c3127 SHA-1: 413855d9a0f4d48e46aff4f1d4981104c27e50de SHA-256: 4f5ad4c3f62a96192cd022bdadfbc9291d8b764bfd99e09e3d205bd4ddc5c9f4
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_LINK_FARM' suggests the document contains a large number of external links, likely to manipulate search engine results or redirect users to malicious content. The presence of embedded URLs further supports this, with one pointing to 'https://xezojetit.ru/award?keyword=cement+plant+equipments+pdf'. No scripts were extracted, but the overall structure and link farm indicate a phishing or redirection attempt.

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://xezojetit.ru/award?keyword=cement+plant+equipments+pdf
    • https://lupemofuxuxutuj.weebly.com/uploads/1/3/1/3/131383332/d54ab810cc6431.pdf
    • https://cdn-cms.f-static.net/uploads/4449614/normal_5fd6665457a2e.pdf
    • http://saripituxupagek.sportsontheweb.net/catalogo_ikea_2020.pdf
    • https://cdn-cms.f-static.net/uploads/4502175/normal_604b0b48adade.pdf
    • https://cdn-cms.f-static.net/uploads/4530910/normal_601af097e1e96.pdf
    • https://doxuvufunufake.weebly.com/uploads/1/3/0/8/130874670/3476980.pdf
    • https://muluxadi.weebly.com/uploads/1/3/1/4/131453645/fitonodaluvamijowe.pdf
    • https://cdn-cms.f-static.net/uploads/4386605/normal_6036c9b61fc92.pdf
    • https://cdn.sqhk.co/famuxina/gh1gcgg/vexiganelugunijudit.pdf
    • https://cdn.sqhk.co/zijigemeworu/cjiYCji/wepakujedetejunukamepuj.pdf
    • https://cdn.sqhk.co/remowiwa/Agchiid/fififunesotubisopedupof.pdf
    • https://cdn.sqhk.co/juwafajem/fkpI0ig/ffx_runner_car_game_online.pdf
    • http://ferafukapawap.scienceontheweb.net/free_english_classes_for_immigrants.pdf
    • https://cdn.sqhk.co/miviluwulux/ijTWn5U/chess_openings_pro_ipa.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/c1b9f3f0-14af-49a1-8b86-d358259616a4/fakatuxif.pdf
    • http://bipegokatif.onlinewebshop.net/kisegato.pdf
    • https://uploads.strikinglycdn.com/files/e767d9ce-d6dd-4fee-a8ac-b71e19d670d2/gewiwudogurifew.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e494.bin
eec2311198495a4bc353016469730966835d49679daeed18a98faa9ab15954d4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE494 2828 bytes
font_01_sfnt_off0000ee9e.bin
b27d346232578aa10589b58cf73cf866823d443f6df552843cdaa86844d338a9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEE9E 5120 bytes
font_02_sfnt_off0000fff2.bin
cdefb10048a5ef73762b17f469fd1c37b29e33c84d11b6b858c170e88d40af57		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFFF2 10828 bytes
font_03_sfnt_off00012527.bin
b1b93bf558ee65cf174bdde98fc70b39c77ddcfeef9d3a00758a58eb2f24951c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12527 16260 bytes

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