Malicious PDF — malware analysis report

Static analysis result for SHA-256 8cff0ed3bd4f6e61…

MALICIOUS

PDF

87.7 KB Created: 2021-04-01 20:14:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8f1b78960570411b8ff3899d21672fd3 SHA-1: 76286c60fa1b4c6d69792c9b2b1eb06430b1ec3c SHA-256: 8cff0ed3bd4f6e61478a064a909740c914fdb3570c419eb0fc9ff864615f94fd
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating high maliciousness. The presence of a PDF link farm with numerous external URLs, such as https://seumenha.ru/wix?keyword=used+laptop+buying+guide+reddit, strongly suggests a phishing or SEO poisoning attack. No scripts were extracted, but the overall structure and heuristic firings point to a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://seumenha.ru/wix?keyword=used+laptop+buying+guide+reddit
    • https://fopojikanerev.weebly.com/uploads/1/3/4/8/134888820/3677010.pdf
    • https://cdn-cms.f-static.net/uploads/4365607/normal_60376390cb7f6.pdf
    • https://cdn.sqhk.co/dabozijide/DkIieow/39902417358.pdf
    • https://kaxogirigajel.weebly.com/uploads/1/3/4/6/134611066/filabixog_fevinepulixu_legumavaxusaxig_bijibetiwadodi.pdf
    • https://static.s123-cdn-static.com/uploads/4408004/normal_5fc5e98ed812f.pdf
    • https://kifowufowuvix.weebly.com/uploads/1/3/5/3/135392599/fobabavomap.pdf
    • http://amaryllis.space/skyrim_sex_mods_in_actionxcxty.pdf
    • https://cdn-cms.f-static.net/uploads/4484356/normal_601708ba7099d.pdf
    • https://lefesime.weebly.com/uploads/1/3/4/8/134882546/62c5dd.pdf
    • https://kinojapi.weebly.com/uploads/1/3/2/3/132302846/lowisax.pdf
    • https://cdn-cms.f-static.net/uploads/4448540/normal_6049237580080.pdf
    • http://egrn-order.online/68262407333srhyn.pdf
    • https://vufomugivubi.weebly.com/uploads/1/3/5/3/135350936/3495534.pdf
    • https://cdn.sqhk.co/kofisosiz/gCQTJmi/instagram_photo_downloader_for_iphone.pdf
    • https://rasazumeg.weebly.com/uploads/1/3/1/4/131454762/wijixojakasosewuxafe.pdf
    • https://cdn.sqhk.co/gebemiwisero/hbhgpO1/95151229003.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://7b806e58-2e0f-4c22-b5e1-e0f71c4d6e86.filesusr.com/ugd/8da65f_30cd6b19cfb4495998b81dff0d4a690b.pdf?index=true
    • https://c2267750-1f6d-4c2f-944a-eb302c7f07d7.filesusr.com/ugd/93971e_d74192a005b64f409d42fd70bfa0b19d.pdf?index=true
    • https://45dcde1a-aed5-4138-b95e-a0f768a283bf.filesusr.com/ugd/89441e_a1ac4ba43a5d4227becae20e4ee98e68.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_off000118c0.bin
2a241d2eb8a9671d1b79ba9dfe8266daec277f200fe39b53ae4f95cb72e7c4f7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x118C0 5360 bytes
font_01_sfnt_off00012b05.bin
4ce16784dabd49c3ecbe7a3c83bece77b47d8ed44d24cc2fca9aed9c80fd89ec		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12B05 10904 bytes

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