Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5808797b3c6a508…

MALICIOUS

PDF

67.3 KB Created: 2021-01-11 11:35:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: d95da291a1e9561f57113581d4b88321 SHA-1: 740cb614ef3387afdd89af37b05c596b56585f2f SHA-256: e5808797b3c6a508a161b6a98af37101eeedef79b303dde972a6db7d702d070f
244 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which are identified as part of a link farm and redirect to known malicious infrastructure. The ML classifier and ClamAV also flagged this file as malicious, indicating a high likelihood of phishing or scam activity. While no scripts were explicitly extracted, the PDF structure and link farm suggest an attempt to lure users to malicious sites.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://cctraff.ru/aws?utm_term=nescafe+dolce+gusto+lumio+manual In PDF document text
    • https://gedepaxu.weebly.com/uploads/1/3/1/3/131378821/b3e752f0e.pdfIn PDF document text
    • https://vigagexagadip.weebly.com/uploads/1/3/1/8/131856194/114697.pdfIn PDF document text
    • https://suludizivot.weebly.com/uploads/1/3/1/3/131383823/nomipefujuvisoza.pdfIn PDF document text
    • https://kovibokasekur.weebly.com/uploads/1/3/4/8/134880184/cec3ab8f65837.pdfIn PDF document text
    • https://buranujepexu.weebly.com/uploads/1/3/4/3/134339299/1061202.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495684/normal_5fb6f2ee94dc5.pdfIn PDF document text
    • https://wevupifusa.weebly.com/uploads/1/3/4/3/134356286/849142.pdfIn PDF document text
    • https://xofilovinavi.weebly.com/uploads/1/3/1/3/131379248/95dc0439e8df.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/bupaxomu/kirklands_job_application.pdfIn PDF document text
    • https://s3.amazonaws.com/miwolezedubujoz/titojufasola.pdfIn PDF document text
    • https://s3.amazonaws.com/tadovu/41656206319.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_off0000c8f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8F3 5216 bytes
SHA-256: c1277802cb58002d73b3d291b8bbcceb5f75c7ba4c711d7c70b2ccf9bb164a31
font_01_sfnt_off0000daad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAAD 11068 bytes
SHA-256: 10d920daf7f02e3dc01dba98ed6368f05bd71ace415c609461b1d2493582b211

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