Malicious PDF — malware analysis report

Static analysis result for SHA-256 e92dcc8955498a0f…

MALICIOUS

PDF

101.8 KB Created: 2021-03-17 09:40:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 15113e56d28e26773d4dd65b4f416523 SHA-1: c079429f3f207becfdab0a379289f013b486e205 SHA-256: e92dcc8955498a0f706e173ef487aedf583a27ee7df4cee7ad7652a76df1f192
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable hosting, and is flagged by heuristics as a link farm designed for SEO manipulation. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and link farm behavior suggest it's designed to redirect users to malicious sites, potentially for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://zajinet.ru/award?keyword=mims+medical+microbiology+pdf+free+download PDF link annotation
    • https://vexuzunudupugez.weebly.com/uploads/1/3/0/7/130740013/pegewetirufebelupolo.pdfIn PDF document text
    • https://dutedurelixuvu.weebly.com/uploads/1/3/4/3/134320021/ximojuj.pdfIn PDF document text
    • http://umkatrade.ru/fezubanzhb5.pdfIn PDF document text
    • https://wefejakero.weebly.com/uploads/1/3/0/8/130814310/f8edf.pdfIn PDF document text
    • http://palitra-cveta.ru/husqvarna_372xp_price_canadau0heb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471683/normal_601f0d178ecf7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452588/normal_600f816fc83d6.pdfIn PDF document text
    • https://laxedojopepab.weebly.com/uploads/1/3/4/8/134896069/03247651acaac.pdfIn PDF document text
    • https://judavolegarar.weebly.com/uploads/1/3/1/8/131871921/rulinewodisen.pdfIn PDF document text
    • http://cetakchantek.com/jelot3oztl.pdfIn PDF document text
    • https://fikadodovawewa.weebly.com/uploads/1/3/4/3/134320255/jofajoxaluj.pdfIn PDF document text
    • https://fogakorix.weebly.com/uploads/1/3/3/9/133997140/kixevami_zotujob_sitefamamofug.pdfIn PDF document text
    • http://artistichomesolutions.com/19378203655j0sln.pdfIn PDF document text
    • http://biotringel.shop/sibezodogoxudadakokew1cei5.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/betefowubevat/android_handle_onclick_in_fragment.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/25844a22-4682-47a6-9e43-7f193d7f0ef1/40740790665.pdfIn PDF document text
    • https://s3.amazonaws.com/fobupojowojon/play_store_apk_android_4._1._2.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/107138a1-c141-4573-86ba-f7b5b843aa5c/what_does_the_numbers_803_mean_in_numerology.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f98e4ca3-09a6-4bee-9711-66bd60da9155/how_to_use_rslogix_emulate_5000.pdfIn PDF document text
    • https://s3.amazonaws.com/towakog/ielts_speaking_with_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a2c63061-8025-4224-9369-6719c9f08f62/solve_the_quadratic_inequality._write_the_solution_set_in_interval_notation.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5c6b8986-34d4-4b7e-a88d-6fa7baec299b/zikoxijodagakimegu.pdfIn PDF document text
    • https://s3.amazonaws.com/datarofapakil/xevoseberavulaga.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011e9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E9C 2828 bytes
SHA-256: 02201fdaf2752f4422f7629c71039e5f766ffabbddac837aa70011d2fb945b01
font_01_sfnt_off000128a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128A6 5524 bytes
SHA-256: 56041d472a02663f65995fdeb0ab1600e08c917159bae537ada675071dba8b7c
font_02_sfnt_off00013b61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B61 11508 bytes
SHA-256: 98d8f53fb555c81027abac0eb54a52c32429a5335e4290b50d653d79eb573064
font_03_sfnt_off000162a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x162A4 16460 bytes
SHA-256: 8c8cf51c762d13ba26e5bbb0462f934d60a3230f650d69bd90e9dc949c84c004
font_04_sfnt_off000178f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x178F0 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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