Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7681d16d93f9f0f…

MALICIOUS

PDF

78.5 KB Created: 2021-03-03 22:40:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: a0a8653512973242a346ddc9a3edf5e1 SHA-1: a8056283134d05d1f718a0fd6e67ce1cb24db88c SHA-256: d7681d16d93f9f0f61e0c4f1f6a2e02b84edf702ae7e3a2290bfbc216dc9a153
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 0.9996

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://ponafet.ru/strik?utm_term=windows+10+brightness+hotkey+not+working PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4459029/normal_6030f66fac250.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484107/normal_5ff80794cfdbc.pdfIn PDF document text
    • http://jokojujut.medianewsonline.com/fl_studio_12_bass_plugins_free_download.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387815/normal_5ff0a6917948e.pdfIn PDF document text
    • https://xukotonaxi.weebly.com/uploads/1/3/1/4/131453431/kalodabutu-fulade-fusasen-liwep.pdfIn PDF document text
    • https://puxupukesif.weebly.com/uploads/1/3/0/8/130813524/jukogiwotuwoge.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459470/normal_60186d7877c22.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424376/normal_5fdbc2fd3f2d0.pdfIn PDF document text
    • https://gomimujexewawid.weebly.com/uploads/1/3/1/0/131070583/3823538.pdfIn PDF document text
    • http://mnclassis.org/johnny_joestar_outfit66s3p.pdfIn PDF document text
    • https://nepazumikad.weebly.com/uploads/1/3/5/9/135958915/sabogotabopid.pdfIn PDF document text
    • http://kelnoteres.xyz/yandex_taxi_armeniagehb9.pdfIn PDF document text
    • http://kufafukedexepix.mygamesonline.org/dell_active_pen_pn556w_tip_replacement.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488137/normal_5fe72a5f9b185.pdfIn PDF document text
    • http://regsenatvumen.website/what_does_5d_mean_on_samsung_washing_machinejk0v4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453342/normal_5fd3319bce0af.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/jolituzoji/carnival_corporation_shareholder_benefit_request_form_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/salosibejodod/tudavodadipixivuw.pdfIn PDF document text
    • http://bodegifu.atwebpages.com/xiruturodobonix.pdfIn PDF document text
    • https://s3.amazonaws.com/wexoteluwag/alkanes_and_alkenes_worksheet_with_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/fuwuzerijofa/borifizuwijojekotisotud.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_off0000f43e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF43E 5448 bytes
SHA-256: e3e44c43c0c55603d623dafe986858cf1d5e21108a7cb0feddef9470d42c45ae
font_01_sfnt_off000106e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106E2 10952 bytes
SHA-256: 8796cb050af412e3bc31afd5d87b88120a42dee1c76da8d59af291fd343c78d8

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