Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e4d3afef6fd1464…

MALICIOUS

PDF

71.7 KB Created: 2021-03-22 13:32:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 0fe0603480690fff1d5caa2670f25618 SHA-1: b9ef5d27c8de45daf25961521088a139b2599801 SHA-256: 6e4d3afef6fd14641e0ea3a759698e526c83574d0809de9016211050ea3b504f
126 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, with multiple heuristics indicating it functions as a link farm on disposable hosting. The embedded URLs, such as 'https://gimoguvi.ru/strik?utm_term=kx+155+installation+manual', are likely intended to redirect users to malicious sites. Although no scripts were explicitly extracted, the PDF structure and numerous external links suggest an attempt to lead the user away from the document for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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 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://gimoguvi.ru/strik?utm_term=kx+155+installation+manual PDF link annotation
    • http://copyright-security-ig.com/7738825852974068.pdfIn PDF document text
    • http://imm-shoes2.club/suxelofilulux1y8uh.pdfIn PDF document text
    • https://silavetej.weebly.com/uploads/1/3/5/3/135314504/banugolemukugorame.pdfIn PDF document text
    • http://lngcliente.com/family_photography_posing_guideiz8gg.pdfIn PDF document text
    • http://sagunutu.medianewsonline.com/65711622636.pdfIn PDF document text
    • http://taher-tcac.com/synthesis_of_copper_iodide_lab_reportz710a.pdfIn PDF document text
    • http://kaxavetaxudu.mywebcommunity.org/22999693420.pdfIn PDF document text
    • http://virivuluk.getenjoyment.net/alternating_current_vs_direct_current.pdfIn PDF document text
    • http://kijekidajefi.getenjoyment.net/cebu_pacific_boarding_pass.pdfIn PDF document text
    • http://tipofeliluget.medianewsonline.com/quantitative_value_investing_strategy.pdfIn PDF document text
    • https://tuwavufubuxa.weebly.com/uploads/1/3/3/9/133997694/6027678.pdfIn PDF document text
    • http://stylecurtains.com/25147100934298kk.pdfIn PDF document text
    • http://kexolifowuj.medianewsonline.com/44267723212.pdfIn PDF document text
    • http://raifaisentgo.online/49614037660ixrxz.pdfIn PDF document text
    • http://1xbets-reg.site/garmin_2699_battery0gnqf.pdfIn PDF document text
    • http://xufelaketodo.getenjoyment.net/penewokagagaxizevigedaz.pdfIn PDF document text
    • http://afracheat3.xyz/12419536214lzfeo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wadoromutisagar.myartsonline.com/58168550453.pdfIn PDF document text
    • https://4f6c49ad-35c2-4e1b-a50e-a4ca4816ee30.filesusr.com/ugd/a28dad_5bb790b8f5fe4458a308a7cb1b348189.pdf?index=trueIn PDF document text
    • http://xufoziminep.onlinewebshop.net/bethena_scott_joplin.pdfIn PDF document text
    • https://a40b6db0-1679-4e03-879f-ac5827b9aa7d.filesusr.com/ugd/dba42a_8dada1e1b70f44d9b2c320b10a23fa23.pdf?index=trueIn PDF document text
    • https://ac09d6fb-20d1-47e2-97cb-2568fc137cdf.filesusr.com/ugd/03dcd4_bca7cf20d5bb46c591c84c8bd2d28b8b.pdf?index=trueIn 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_off0000d2d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2D6 4948 bytes
SHA-256: 082a0b84a8f8a3a51ad145cebc37b1ea74da17b2999d02ee124283a7495179ad
font_01_sfnt_off0000e3af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3AF 13672 bytes
SHA-256: e9648a5c9360e60c5e3fe0e7b165d7f551729f3e8793f8f9ecb5cd53f117c941

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