Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1e1096026ad5b43…

MALICIOUS

PDF

71.8 KB Created: 2021-02-09 08:41:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: c3a158993f724360322c24ae1d4340e8 SHA-1: 284a5d1747f776851c6624c2bcf4e4a60c52a9b3 SHA-256: e1e1096026ad5b43bdbc365f7b1e1cf06c6885ca4e85a474aeb883b785eb7405
156 Risk Score

Malware Insights

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

The PDF file contains a mass of external links, many of which are disguised as legitimate documents, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external links point towards an attempt to redirect users to malicious sites.

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://seumenha.ru/wb?keyword=sbi%20personal%20loan%20application%20format PDF link annotation
    • https://dojilosadokadog.weebly.com/uploads/1/3/4/8/134890500/9d266354.pdfIn PDF document text
    • https://bozajeja.weebly.com/uploads/1/3/6/0/136082115/bupemabax.pdfIn PDF document text
    • http://trokot-online.xyz/slingo_50_free_spins_codeslv7b.pdfIn PDF document text
    • https://lefoteliwe.weebly.com/uploads/1/3/4/0/134095852/2039058.pdfIn PDF document text
    • http://graatorama.space/srs_airbag_light_reseth1zbs.pdfIn PDF document text
    • http://in-step.shop/89468134041k1nv2.pdfIn PDF document text
    • http://nakanilo.club/duxixeja9qed2.pdfIn PDF document text
    • http://raifaisentapp.online/83250342562gj6xz.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/sitozi/email_template_responsive_font_size.pdfIn PDF document text
    • https://s3.amazonaws.com/bikikanafopavu/depreciation_expense_effect_on_balance_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/bevekizadoxuj/58563879390.pdfIn PDF document text
    • https://s3.amazonaws.com/xisefowu/litumabipovogobevudoxaze.pdfIn PDF document text
    • https://s3.amazonaws.com/xezonijida/case_study_introduction_template.pdfIn PDF document text
    • https://s3.amazonaws.com/rizijubovapuk/poe_cyclone_leveling_guide.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_off0000dc21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC21 5404 bytes
SHA-256: abe129a97fc6af6dd2dfaea8f6e158ed6995cdb078fabb1f31a7118ca978940a
font_01_sfnt_off0000ee69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE69 10632 bytes
SHA-256: 0f9a2b01a3b8f9e95d3a066deeb8a799eae1955b3bf0d5da54d9b8c1004a4f8a

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