Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc07d30eeb8043cd…

MALICIOUS

PDF

67.9 KB Created: 2021-02-15 02:58:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 5512184e06f7c93825137fcf052e7550 SHA-1: 8159e6dbe727289aeddce176c458b8c5d8d97e33 SHA-256: bc07d30eeb8043cd80ce860de838d7b14f23a7f2e1665aeba15be21455ea6be9
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://druttle.ru/wix?keyword=forever+21+promo+june+2020 PDF link annotation
    • http://vnatural.space/dejenefulogomosakek4gg2k.pdfIn PDF document text
    • http://wordwild-store.com/racing_gears_advance_onlinel5ij3.pdfIn PDF document text
    • http://thelandofbadideas.com/odia_song_2019_neweijp6.pdfIn PDF document text
    • https://nopubogap.weebly.com/uploads/1/3/4/6/134667077/zafamanevisew.pdfIn PDF document text
    • https://pebufaso.weebly.com/uploads/1/3/5/4/135400671/detixabisa-gosetek-zapeveregixi-vifeso.pdfIn PDF document text
    • https://jawifeguviweti.weebly.com/uploads/1/3/2/3/132302916/f5b6aa984385fdf.pdfIn PDF document text
    • https://birirewenojitu.weebly.com/uploads/1/3/0/8/130813362/2927339.pdfIn PDF document text
    • http://magazinrf.xyz/445001869940kz3s.pdfIn PDF document text
    • https://wojaginobaxap.weebly.com/uploads/1/3/1/8/131857211/f68ddfcaf.pdfIn PDF document text
    • http://stixlife.info/sogang_korean_1a_workbookueqml.pdfIn PDF document text
    • https://ramemegu.weebly.com/uploads/1/3/1/3/131383760/sukirumipun.pdfIn PDF document text
    • https://divowotekek.weebly.com/uploads/1/3/4/7/134759223/873138.pdfIn PDF document text
    • http://beremoter.online/descoware_vs_le_creusetpe5kr.pdfIn PDF document text
    • http://arenaprobet.com/51962818528k6et5.pdfIn PDF document text
    • https://nukoxifade.weebly.com/uploads/1/3/4/3/134332817/42f43.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zaritopewebo.rf.gd/jetipijaroparugi.pdfIn PDF document text
    • http://diruben.rf.gd/medical_mycology_case_reports_abbreviation.pdfIn PDF document text
    • http://wukosow.epizy.com/revudaporosobumijeduxowug.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_off0000cde4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDE4 4964 bytes
SHA-256: bc8c05252ea317a676d2c8ac276373437dd8c5f80b4d645c999b4b8f3149eb34
font_01_sfnt_off0000dec7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEC7 10512 bytes
SHA-256: 85c3966b5298017ca0567e75ccca3067988dd22a3c482a432dedfd33adc04e12

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