Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2034a5b605be1f5…

MALICIOUS

PDF

81.6 KB Created: 2021-06-09 19:58:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: ee84d034daa8fd910faa8d2b2c593a99 SHA-1: 05e70901dc656210d9ce3d869285d80782e63983 SHA-256: e2034a5b605be1f57fe050c7fc30ae431130ed776d3bca485cc64f84ab392fff
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable hosting services, suggesting a link farm designed to redirect users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as a phishing trojan. The embedded URLs and the nature of the link farm point towards a phishing or scam campaign aiming to direct users to potentially harmful content.

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://coretry.ru/pbw?utm_term=how+to+become+successful+and+rich+pdf PDF link annotation
    • https://jatekowi.weebly.com/uploads/1/3/0/7/130776123/badut_fujemezuzori.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471256/normal_6064f63f14593.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485321/normal_5ff8cb173eb6b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413474/normal_6044590c4ed6d.pdfIn PDF document text
    • https://xidoxuzi.weebly.com/uploads/1/3/4/7/134707988/zexoliteseponenotewu.pdfIn PDF document text
    • https://tagipuzato.weebly.com/uploads/1/3/0/7/130776724/jifopalerafise.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405420/normal_6027bf9c234d1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459182/normal_602d810694aa3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4502245/normal_6051b2cdaa435.pdfIn PDF document text
    • https://mosazipabefo.weebly.com/uploads/1/3/4/7/134735261/xegupelomimif.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472185/normal_6029cd9cd47fa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418558/normal_602c499d4c584.pdfIn PDF document text
    • https://keninowe.weebly.com/uploads/1/3/4/6/134617270/fukikobox-duvaledevavi-latenetorujezul-soxewakigiz.pdfIn PDF document text
    • https://miruvogix.weebly.com/uploads/1/3/1/4/131408245/puwuvik.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/bcc5e820-c1e7-4c2f-95c4-0144580d2f58/dexubidowezoxaf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/617c8377-4428-47fe-8028-a2b29cfc7f69/does_kawaki_like_himawari.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d279014d-0013-4182-9760-336c4e14a7b3/11921103068.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9c37e61e-531c-4920-8100-9adeffa32077/hi_point_c9_laser_holster.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/06db3a1d-da22-4c3d-99ac-f89d21444dd4/railway_traction_book.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_off0000f353.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF353 3248 bytes
SHA-256: e22f2af335494f21f4d2f94f50cdb8f87fbf066c512a7beede2c318612172ab5
font_01_sfnt_off0000ff0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF0E 5588 bytes
SHA-256: 74c26cc5f6df8dd6fbdbd989354cc03f5a4d077add43dd021b5fee3e90761f3c
font_02_sfnt_off000111ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111EC 10904 bytes
SHA-256: 7962ce49565211ee303a2b3f3ded136efee5d7f0522801ad11a8316287001eeb