Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2036a103fa65cd1…

MALICIOUS

PDF

76.0 KB Created: 2021-02-07 19:46:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 0de86c3e277d33107911209b38604936 SHA-1: ab5afd1bc456835a501bf813e32b1987b5f91bbc SHA-256: c2036a103fa65cd1b2572ebeeb2ba87c005fcdd83979a9c40ed0a2ec1fcdceb9
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://leonvi.ru/aws?utm_term=apa+format+annotated+bibliography+internet+source PDF link annotation
    • http://parralax.net/marley_and_me_full_movie_online_free_no_downloadaodqh.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404514/normal_5fcdb26e6c2bd.pdfIn PDF document text
    • https://nerapusu.weebly.com/uploads/1/3/1/4/131438180/kerijokumi-navepalalug-mekejinaso.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369520/normal_5fcf10d128df9.pdfIn PDF document text
    • https://tekemuwuva.weebly.com/uploads/1/3/0/7/130775778/kebuzibopuwulez.pdfIn PDF document text
    • http://converstarget.ru/limitogevugikegipipaxudes4m0mg.pdfIn PDF document text
    • https://repotadidutu.weebly.com/uploads/1/3/4/3/134310826/28497c11b03df1e.pdfIn PDF document text
    • https://xixozikitep.weebly.com/uploads/1/3/4/0/134097223/1515d28f3168.pdfIn PDF document text
    • http://static-get.top/sponges_cnidarians_and_ctenophoresfsbk7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478716/normal_6012369908f4f.pdfIn PDF document text
    • https://zedifetizigofup.weebly.com/uploads/1/3/5/3/135393349/3783351.pdfIn PDF document text
    • https://tamukatiraf.weebly.com/uploads/1/3/4/7/134766395/4250669.pdfIn PDF document text
    • http://medgaj.com/dsssb_ntt_answer_key_88_17uz7ra.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471238/normal_5ffe1472e33d5.pdfIn PDF document text
    • http://useraisins.pro/nuripewivewanefa5ax9s.pdfIn PDF document text
    • http://fotonagosuslugi-01.space/nudimabivilosemirutedatubi5uj.pdfIn PDF document text
    • https://xubidanata.weebly.com/uploads/1/3/4/8/134895671/dexutalemivenel_ganizotufe_babutofemedoj_jibidakogab.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/kezemiradigu/free_live_tv_app_for_android_box.pdfIn PDF document text
    • https://s3.amazonaws.com/fizufapu/xaxidenerezukawakukumek.pdfIn PDF document text
    • https://s3.amazonaws.com/kujapomib/whatsapp_app_now_2017_tv.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_off0000eae0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAE0 5800 bytes
SHA-256: 2939f32b02da683c52b9b9bde38db1970e7b12c34c106730055000e3b13477ce
font_01_sfnt_off0000fe80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE80 10416 bytes
SHA-256: e4424b483fb350efbc9504c097e674afe7bd8249999c9f279852849862824ecf

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