Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8add1385a9ad814…

MALICIOUS

PDF

73.5 KB Created: 2021-02-19 13:16:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 79fa515afa21a197f65f5c1334257cc1 SHA-1: 3477a1ca35ef41eb23169a33fdd105f44a669ee0 SHA-256: e8add1385a9ad81471a7fa7245561492467c0628c6c40e24113296b0e02c700d
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to PDF files on file-sharing services, indicative of a link farm or phishing campaign. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are consistent with techniques used to redirect users to malicious sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://druttle.ru/strik?utm_term=plantronics+backbeat+go+410+wireless+headphones+active+noise+canceling+earbuds+graphite PDF link annotation
    • https://zewadozodatigi.weebly.com/uploads/1/3/4/3/134337643/3901171.pdfIn PDF document text
    • https://goxadivitekoze.weebly.com/uploads/1/3/1/4/131437736/5805040.pdfIn PDF document text
    • https://cdn.sqhk.co/dewozoju/8gjPJNB/nukavudivasenemigazudu.pdfIn PDF document text
    • https://cdn.sqhk.co/wofamofupu/ibzihx2/lord_of_empire_elite.pdfIn PDF document text
    • http://mafonofolifeda.22web.org/91810405744.pdfIn PDF document text
    • https://wotigutaz.weebly.com/uploads/1/3/4/3/134361511/5537895.pdfIn PDF document text
    • https://kurenilomu.weebly.com/uploads/1/3/4/0/134042522/5564630.pdfIn PDF document text
    • https://ruxelasukosife.weebly.com/uploads/1/3/4/6/134667582/3057374.pdfIn PDF document text
    • https://lolekujawifom.weebly.com/uploads/1/3/1/0/131070351/biwunojegu.pdfIn PDF document text
    • https://cdn.sqhk.co/gisatajofo/QW2ghig/pixel_fury_multiplayer_in_3d_apk.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/mikibetiv/newiredix.pdfIn PDF document text
    • https://s3.amazonaws.com/jidosatikim/que_dia_tem_feriado_em_novembro.pdfIn PDF document text
    • https://s3.amazonaws.com/wuxupewu/antibiotic_prophylaxis_guidelines_orthopedic_surgery.pdfIn PDF document text
    • https://s3.amazonaws.com/zufaxepixiguxax/movubudogutujaxeputa.pdfIn PDF document text
    • http://figejadinopi.rf.gd/30550343309.pdfIn PDF document text
    • http://dubaduvuk.rf.gd/the_pictorial_key_to_the_tarot_review.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_off0000defc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEFC 5976 bytes
SHA-256: 109a7227402f323b9bddaa1e6a00017da6b6a97e95c69326fd1e3c8fe7e01252
font_01_sfnt_off0000f36d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF36D 10808 bytes
SHA-256: 26f6954d4c9acf23121816dd7fd36316184c39bca27239714ed38d09ba1442cb

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