Malicious PDF — malware analysis report

Static analysis result for SHA-256 494a0b662e2fa5ac…

MALICIOUS

PDF

83.6 KB Created: 2021-03-24 14:52:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bb6bec0206906ce1479e3e3bfb31c9fb SHA-1: 7d61055b3ba45bac51f9d64bb438db87aed76500 SHA-256: 494a0b662e2fa5ac7c38e6574fed067bd9540fda54b3b5d930bdcd9d61012f4c
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or a distribution point for malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the nature of the PDF and the numerous external links point towards a spearphishing attachment used to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://golowaki.ru/award?keyword=basic+definitions+in+electronics+and+communication+engineering+pdf
    • https://cdn.sqhk.co/wemojezuvegi/VW2Mibe/sonny_and_cher_show_dvd.pdf
    • http://grenkasalo4.xyz/fepatokegapoganiqh2qk.pdf
    • https://gulurevipad.weebly.com/uploads/1/3/5/3/135349864/3027612.pdf
    • http://prazdnikprosto.ru/nevebavedodipuexfcr.pdf
    • http://chemistryplus.space/school_management_system_using_linked_list_in_c74n2h.pdf
    • https://cdn.sqhk.co/bawusipa/ziifuO9/garnet_hill_linen_sheets_reviews.pdf
    • https://cdn.sqhk.co/fuvebopeweb/jdjfhhF/lg_xboom_speaker_system_with_karaoke_creator_rk7.pdf
    • https://xaruxetadelu.weebly.com/uploads/1/3/4/4/134478950/7892640.pdf
    • https://cdn.sqhk.co/tinupolureg/Yehcjca/gefalunifilujo.pdf
    • https://cdn.sqhk.co/gijosevozu/gjgUQtv/knock_down_frame_vs_welded_frame.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://8d5bcf17-53f2-4f21-b585-7a27aef14131.filesusr.com/ugd/7baf93_1b16713ffb544385a9cc4335cbc5d70b.pdf?index=true
    • https://uploads.strikinglycdn.com/files/95653d2d-06f3-44a6-b248-69f963053928/xejorexatabunikajob.pdf
    • https://47a25507-5c4f-4e73-9b7c-0c49514c8174.filesusr.com/ugd/e00bd3_0bea7879dcb44c3fa79feeb2f72634c0.pdf?index=true
    • https://801a9f91-e12c-4b3a-b535-42c3eaff61c8.filesusr.com/ugd/d237ef_8b388202e8a643e996712a77586a4d90.pdf?index=true
    • https://uploads.strikinglycdn.com/files/3473c631-fe77-4342-a2d3-06b752b3e2f8/lejadudapojirugomodovirez.pdf
    • https://uploads.strikinglycdn.com/files/ed32e33b-2ce5-4b18-a6c9-17c50aa4f010/3703653784.pdf
    • https://d99d9bf7-a5e0-49f2-90ac-0d1bc881463d.filesusr.com/ugd/0182ef_a9a47e4c8eeb4093bf711c8367dd5a89.pdf?index=true
    • https://80b1f93a-fe74-4439-a81d-34814fa7a505.filesusr.com/ugd/e56fe2_69f3eb4771d842ddbe78533e0fb65a62.pdf?index=true
    • https://af1bea64-f5cd-41c2-a7c1-97f21c1aa057.filesusr.com/ugd/592671_bfdaefab539141c6b112c8f6f3f1914a.pdf?index=true
    • https://4bf641bf-117a-4913-931f-55e49063997f.filesusr.com/ugd/5befcb_f89397c579774126b43e0faa3db648df.pdf?index=true
    • https://da5bec28-7969-4117-8ffb-5069fce5e80c.filesusr.com/ugd/31593d_4207029a0e584832ae4f949aea32c89a.pdf?index=true
    • https://61df3396-90b5-4b69-a3ae-475c9da6ebc5.filesusr.com/ugd/516574_50f967450a6b41139d596cf8a81336d2.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_off00010677.bin
78785411505e1b1c181b04a6d6cab158a7fc131567fa969d52a1c3357e14b001		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10677 5524 bytes
font_01_sfnt_off0001192c.bin
5102e44597e887abba8997274b827e47c1f1a00edc1bdad5ecd36f715fa60029		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1192C 11508 bytes

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