Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3ba768c6ac22be4…

MALICIOUS

PDF

71.1 KB Created: 2021-03-20 14:29:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 81d5430224f1796850d7adbefa6e3012 SHA-1: 8552d0c757ae5c82a3feebd394cfe3b5e30f1854 SHA-256: a3ba768c6ac22be45239afbba337c47b4dfd54e1f59dc6cd219a1368d0ca9438
156 Risk Score

Malware Insights

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

The sample is a PDF file identified as malicious by ClamAV and an ML classifier. It contains a large number of external links, many of which are hosted on suspicious domains, suggesting a link farm or phishing attempt. The PDF_SEO_LINK_FARM heuristic indicates a deliberate attempt to create a large number of links, likely to distribute malicious content or engage in SEO abuse. While no scripts were explicitly extracted, the presence of external links and the nature of the heuristics suggest potential for further malicious activity, such as downloading a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://jottigo.ru/award?keyword=statistical+rethinking+a+bayesian+course+with+examples+in+r+pdf PDF link annotation
    • https://cdn.sqhk.co/pipugisoveku/Kijjdhh/dozomobiniwi.pdfIn PDF document text
    • http://girlita.space/95344307354t0elp.pdfIn PDF document text
    • https://cdn.sqhk.co/letopoto/jjOkAUX/coursera_machine_learning_quiz_answers_week_2.pdfIn PDF document text
    • https://bopunesarikimar.weebly.com/uploads/1/3/1/4/131453984/1223191.pdfIn PDF document text
    • https://radokixudex.weebly.com/uploads/1/3/5/3/135342076/1220433.pdfIn PDF document text
    • https://cdn.sqhk.co/girewobo/7lhh4gg/diy_wood_projects_plans_for_beginners.pdfIn PDF document text
    • https://liruviwogaralo.weebly.com/uploads/1/3/0/7/130776788/rewoludunakimej.pdfIn PDF document text
    • https://cdn.sqhk.co/satidaruxami/eQtkxAj/knights_inn_corpus_christi_tx.pdfIn PDF document text
    • https://cdn.sqhk.co/baxotonad/iaB93tH/53554097564.pdfIn PDF document text
    • http://yoptan.space/dj_khaled_im_the_one_mp3_downloadm58vc.pdfIn PDF document text
    • https://rowimunikak.weebly.com/uploads/1/3/5/3/135346477/72e50db9b6727ab.pdfIn PDF document text
    • https://vubenazago.weebly.com/uploads/1/3/4/3/134357699/pubavapusaripol_baziguwezawem.pdfIn PDF document text
    • https://kalakibujupe.weebly.com/uploads/1/3/0/7/130740073/5545446.pdfIn PDF document text
    • https://saxexowiki.weebly.com/uploads/1/3/0/9/130969873/2803823.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/geradi/comparing_and_ordering_decimals_5th_grade_worksheets.pdfIn PDF document text
    • https://s3.amazonaws.com/daraniwekamidir/pefuvigujabozawowewul.pdfIn PDF document text
    • https://s3.amazonaws.com/redegelesibif/konovisuvito.pdfIn PDF document text
    • https://s3.amazonaws.com/nisiwanolom/strong_spas_installation_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/dutuzanob/fapugimakerikami.pdfIn PDF document text
    • https://s3.amazonaws.com/mukut/83687792577.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_off0000d401.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD401 6140 bytes
SHA-256: 358ec5c27d2f9a4e80fe0d7bc22fb4d3321e938ea459178d27fa53889acc5a05
font_01_sfnt_off0000e8d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8D1 10508 bytes
SHA-256: 33b345f819f279b3db0ff757f6e5e082699a81cbe2859fac3933f573530737a7

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