Malicious PDF — malware analysis report

Static analysis result for SHA-256 6287b4dac4ca95aa…

MALICIOUS

PDF

79.2 KB Created: 2021-03-02 14:41:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 788a10c438d417a56620c4ac8fcd1986 SHA-1: 908e9ef7a4b1ec6ba419a70a9daad91a12df2c91 SHA-256: 6287b4dac4ca95aaf146f25d726217ac9038a5cd6a2187a042978e2561f6562f
194 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

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 and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=gerund+phrases+worksheet+with+answers PDF link annotation
    • https://fapojenulexo.weebly.com/uploads/1/3/1/3/131383319/duvisozesim.pdfIn PDF document text
    • http://reduslim-shopofficial.site/dslr_camera_photo_editor_pcrzbmi.pdfIn PDF document text
    • https://patapirebitogi.weebly.com/uploads/1/3/0/8/130814085/50facf4229784.pdfIn PDF document text
    • http://everydayy.fun/6453688099e9qn1.pdfIn PDF document text
    • https://bowineno.weebly.com/uploads/1/3/4/8/134868267/jofefumivudotexe.pdfIn PDF document text
    • https://xadigepuve.weebly.com/uploads/1/3/1/4/131454317/fifebanafimexus_fojodotop_sifivutafuzaf.pdfIn PDF document text
    • https://kiburosipaso.weebly.com/uploads/1/3/4/6/134601321/zumirokova.pdfIn PDF document text
    • https://tisemadu.weebly.com/uploads/1/3/4/3/134387657/fifufuk.pdfIn PDF document text
    • http://beamorem.com/end_of_the_world_movies_on_netflix_canadal7lkl.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387701/normal_6028772636f83.pdfIn PDF document text
    • https://cdn.sqhk.co/kugugofawaz/ichaCO0/word_of_the_day_generator_ks1.pdfIn PDF document text
    • https://cdn.sqhk.co/sebixodof/2lXEcpF/chase_mobile_deposit_check.pdfIn PDF document text
    • https://gapivawaki.weebly.com/uploads/1/3/1/8/131857152/fejapukoropulidose.pdfIn PDF document text
    • https://firunonosud.weebly.com/uploads/1/3/6/0/136052948/punezila.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/wukara/letterhead_template_example.pdfIn PDF document text
    • https://s3.amazonaws.com/leteraxewe/fair_lawn_nj_police_accident_reports.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f88b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF88B 5204 bytes
SHA-256: adee35821563101ac5805727adc480a2f4aa5ea4689cac45cd300672f4ba932c
font_01_sfnt_off00010a48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A48 11152 bytes
SHA-256: b0dbff2ea3b61226b889e69108c3d63c6ecc436dcb05884a7fda6380727398af

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