Malicious PDF — malware analysis report

Static analysis result for SHA-256 b05cbd9c0ef7795c…

MALICIOUS

PDF

78.0 KB Created: 2021-01-18 19:02:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: e2234a8bc3364ae5c9087321210827ca SHA-1: 9a8cd7e035db201843e7035bd7717585a8975e10 SHA-256: b05cbd9c0ef7795cbd466e6cfbe38059541fc2c112a8bcc7e89979af17d10f7d
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous external links, many pointing to Weebly-hosted PDFs with generated-looking slugs, indicative of a link farm or SEO spam. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were directly extracted, the PDF structure and embedded URLs point towards a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://trafffi.ru/aws?utm_term=bioassay+definition+pdf PDF link annotation
    • https://loguxofe.weebly.com/uploads/1/3/0/7/130775118/xudutibuleruned-zewosolopel-ratuvukajulur.pdfIn PDF document text
    • https://pofitefe.weebly.com/uploads/1/3/4/6/134617546/nezurexekonej.pdfIn PDF document text
    • https://tanaxigurav.weebly.com/uploads/1/3/4/2/134266775/cbd6ffd5f.pdfIn PDF document text
    • https://bosebekepomij.weebly.com/uploads/1/3/4/8/134870535/4742093.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451212/normal_5fb2a49e7ea09.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460982/normal_5fc09ca8d72da.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411926/normal_5fe64b0cdc96a.pdfIn PDF document text
    • https://site-1178386.mozfiles.com/files/1178386/19131317993.pdfIn PDF document text
    • https://sujajikozodes.weebly.com/uploads/1/3/1/3/131384638/8463818.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/sugowubuf/80093927943.pdfIn PDF document text
    • https://s3.amazonaws.com/takebemanijewok/86361289106.pdfIn PDF document text
    • https://s3.amazonaws.com/degisapemifa/avoid_ticketmaster_service_fees.pdfIn PDF document text
    • https://s3.amazonaws.com/veraxawewib/spider_man_2_apk_free.pdfIn PDF document text
    • https://s3.amazonaws.com/metubevozisul/98825596567.pdfIn PDF document text
    • https://s3.amazonaws.com/juzinaramip/duxukosekanamegivudege.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f3e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3E7 5060 bytes
SHA-256: 3adb37e0c62d75059b72d2d0653a5006670f3f6c3e18e41a7370abf92aca48f0
font_01_sfnt_off00010543.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10543 11104 bytes
SHA-256: 09bf52341ebdbcb1dbde120c1a38b018305da80d7ba47836be9fe598bc63eb94

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