Malicious PDF — malware analysis report

Static analysis result for SHA-256 52b048ac6be177d3…

MALICIOUS

PDF

73.4 KB Created: 2020-11-10 19:48:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 47d9a0de1e871c643b196ca4523b1921 SHA-1: 1d2caf1d3c2688cd594512a56354e89250760788 SHA-256: 52b048ac6be177d3721ea993df92f9862a08238ff5fe12ef0bdab27dcff396aa
226 Risk Score

Malware Insights

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

The PDF contains a lure related to payment confirmation or changes to bank details, a common tactic in business email compromise attacks. It includes numerous external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to facilitate phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • 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.
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise 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://traffnew.ru/strik?keyword=confirm+of+receipt+of+email PDF link annotation
    • https://wikamarelifegef.weebly.com/uploads/1/3/4/3/134380256/guwapixegit-bemom-vuxun-leloribenenupi.pdfIn PDF document text
    • https://kakoxisowi.weebly.com/uploads/1/3/4/3/134358665/3324123.pdfIn PDF document text
    • https://saxibodusazo.weebly.com/uploads/1/3/0/7/130740440/piwesuzawofox.pdfIn PDF document text
    • https://bitekiparoduj.weebly.com/uploads/1/3/4/0/134017536/mosudozon.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413462/normal_5f93d43bca427.pdfIn PDF document text
    • https://mizunawakore.weebly.com/uploads/1/3/1/4/131406356/werij.pdfIn PDF document text
    • https://dexixafavako.weebly.com/uploads/1/3/4/3/134348567/5276199.pdfIn PDF document text
    • https://medizagokitoni.weebly.com/uploads/1/3/2/3/132303310/rojezumadizetazaj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379849/normal_5f94c54b39e93.pdfIn PDF document text
    • https://bajevopado.weebly.com/uploads/1/3/4/4/134456845/9972600.pdfIn PDF document text
    • https://sifizebutu.weebly.com/uploads/1/3/0/8/130814914/db8917f1f7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/28238bd0-2748-49cd-b4b5-85324cfbbc11/28118554103.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/19edbe29-5b7f-47f6-95d9-4a4daa46fd0e/58873064991.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fb495c28-57af-46da-89ab-07c5873de77d/velevogikolokubusokudil.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d5a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5A7 4792 bytes
SHA-256: 0e230770c4436e0929ad10d0fcd72d7b046f3640fb3a94ef4c9ac3d1665a96be
font_01_sfnt_off0000e5c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5C9 10780 bytes
SHA-256: 11df2726be9a342ff98d3984416347279f5d83d9fe104b4d65521bd812c3e6ca
font_02_sfnt_off00010a73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A73 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230

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