Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b124b3f866ac610…

MALICIOUS

PDF

79.6 KB Created: 2021-02-14 11:43:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 6dbc556c52a7ed8e28ce5d3d57aa7723 SHA-1: 6bd4f904f6d99b896d66e5ea94043e6defeacaaf SHA-256: 4b124b3f866ac610071c3c01e279698bd0e49d1dd82c6d84c9d6c9b60d7fe310
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, identified as a link farm, with the primary URL suggesting a lure related to a book search. ClamAV detected this as a phishing trojan, and ML classification strongly supports maliciousness. The presence of embedded URLs and the nature of the link farm indicate an attempt to redirect users to potentially malicious content, likely for phishing or SEO spam.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://maypoin.ru/wix?keyword=roald+dahl+charlie+and+the+great+glass+elevator+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4489257/normal_600e7a1f53161.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405414/normal_60152db5ea9fe.pdfIn PDF document text
    • https://fejunula.weebly.com/uploads/1/3/4/3/134363834/f34e98734.pdfIn PDF document text
    • http://kind-insta.site/facebook_apk_dark_mode_2019ojvmq.pdfIn PDF document text
    • https://cdn.sqhk.co/gunonutib/ifehjjj/saxedubulutojade.pdfIn PDF document text
    • http://karaulovlife.site/hydro_gear_cross_referenceku26u.pdfIn PDF document text
    • http://itsamorem.com/gopazalibusajanobejujakuki4ei.pdfIn PDF document text
    • https://cdn.sqhk.co/vixuzemabad/ZjjHGgd/cute_cat_images_full_hd.pdfIn PDF document text
    • https://ziwagunu.weebly.com/uploads/1/3/4/8/134883986/tebogevotef.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388426/normal_601f55b676020.pdfIn PDF document text
    • http://scriptbook.xyz/wallpaper_dark_coloryfg1o.pdfIn PDF document text
    • https://cdn.sqhk.co/kusamika/uIjjGy7/dupudejuzomu.pdfIn PDF document text
    • https://cdn.sqhk.co/xojafimib/Cgj4Vjg/6662737312.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383304/normal_60257c1947080.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/xamibudasagas/training_completion_certificate_template_free.pdfIn PDF document text
    • https://s3.amazonaws.com/saziwijaxodav/39039457188.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e6e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6E6 5272 bytes
SHA-256: 26279cdfe5de725b0985b15c0db2307b1ed20e9a987363459615ded6c2c3d92f
font_01_sfnt_off0000f8d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8D2 13376 bytes
SHA-256: 8ef0b6e3b53edfd6d84444566b50909839c1c9510831d5e17a4175174b99a1a8
font_02_sfnt_off0001234a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1234A 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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