Malicious PDF — malware analysis report

Static analysis result for SHA-256 d40430abaebca06a…

MALICIOUS

PDF

88.1 KB Created: 2021-03-13 17:40:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 67e5eb7abda090301f2797bad302fb39 SHA-1: 27ab78b1cb40438d99cbafc57a22b6d50dd2b620 SHA-256: d40430abaebca06a5cdcdbee22ebf1501d30272345dd6904ae48e58094fed4de
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF_SEO_LINK_FARM heuristic identified a large number of external links, suggesting a link farm or SEO manipulation tactic. While no scripts were explicitly extracted, the PDF_URI heuristic points to an external URL that could be used to deliver a payload or redirect the user to a phishing site. The document body's content is heavily obfuscated, but the presence of 'bass guitar notes for beginners pdf' suggests a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jacksth.ru/award?keyword=bass+guitar+notes+for+beginners+pdf
    • https://static.s123-cdn-static.com/uploads/4452595/normal_5fd07ffd58c94.pdf
    • https://dapalijika.weebly.com/uploads/1/3/0/7/130738969/9845058.pdf
    • https://faniruwesil.weebly.com/uploads/1/3/5/9/135993686/pokadarekoginazubida.pdf
    • https://cdn-cms.f-static.net/uploads/4446285/normal_60362f051d365.pdf
    • https://cdn-cms.f-static.net/uploads/4421036/normal_6010902eca74c.pdf
    • http://valigulepi.scienceontheweb.net/rovojedutere.pdf
    • https://feziriwavejoli.weebly.com/uploads/1/3/4/0/134096108/dokolunepibovetizu.pdf
    • https://rofikilidoxomuk.weebly.com/uploads/1/3/4/0/134017179/jaxumufumanuvukovawu.pdf
    • http://zegererevez.medianewsonline.com/what_is_stored_program_control.pdf
    • http://puvepum.getenjoyment.net/72349214093.pdf
    • https://bakigimos.weebly.com/uploads/1/3/4/3/134322269/89b601c79915266.pdf
    • http://xazixovabifin.medianewsonline.com/rijakanusojewabezabarivex.pdf
    • http://gepanukotex.getenjoyment.net/tesuxataj.pdf
    • https://momugidofene.weebly.com/uploads/1/3/4/2/134235368/zidodavarizokibe.pdf
    • http://xawikeroteguvu.iblogger.org/calendar_date_photoshop_template.pdf
    • https://wotigutaz.weebly.com/uploads/1/3/4/3/134361511/1544774.pdf
    • https://rozazokosu.weebly.com/uploads/1/3/0/8/130813972/4271643.pdf
    • http://wowogobofomufu.mygamesonline.org/mckenzie_back_stretches.pdf
    • https://fozaronu.weebly.com/uploads/1/3/5/3/135349809/1ff4c1e.pdf
    • https://static.s123-cdn-static.com/uploads/4481052/normal_5ff8544c3da20.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://gutekuretejapoj.onlinewebshop.net/catalogo_vimar_plana.pdf
    • http://jujuletofu.onlinewebshop.net/cch_chuyn_i_sang_nh.pdf
    • http://fiforeru.atwebpages.com/ronogojug.pdf
    • http://regipikiwubadov.epizy.com/63213580100.pdf
    • http://wijinap.rf.gd/12171070839.pdf
    • http://nolopunupibu.rf.gd/vawobomuf.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010f0f.bin
8830f67d1cefa43f1bae92c95249e195253feef088b8c83cafbd9907f1701faf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10F0F 5368 bytes
font_01_sfnt_off00012150.bin
51ebeec29509b87aa858d500e37ac8853184703d07d1f913ce36d8e1dc7764c0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12150 1800 bytes
font_02_sfnt_off000129de.bin
066f7769d588ec38ccefe05b64fd25fab2321d4af92f0d973f50af6c7ec45287		 pdf-font-stream PDF embedded font (sfnt) at offset 0x129DE 12380 bytes

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