Malicious PDF — malware analysis report

Static analysis result for SHA-256 b554a16f6fd90914…

MALICIOUS

PDF

78.9 KB Created: 2020-11-13 18:53:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: cdccd6e90c5e7e23b6f5efeb84e3dcc8 SHA-1: 171ea60af06061bb9c5f35412b9fa14169252c4b SHA-256: b554a16f6fd9091450a483de8932c93f2ca4c75d34932ccee272017925375591
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm designed to redirect users to potentially malicious sites. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan. The embedded URLs and the heuristic firings strongly suggest a phishing or malware distribution campaign.

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://trafftec.ru/123?utm_term=teclast+98+air+3g PDF link annotation
    • https://kusezobovezuzeg.weebly.com/uploads/1/3/4/6/134689385/7919f33e42c13.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485450/normal_5fa8775261e04.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379982/normal_5faad163e8c86.pdfIn PDF document text
    • https://pagofere.weebly.com/uploads/1/3/1/3/131398194/ripewimu_suvidumutilexo.pdfIn PDF document text
    • https://fevixivosetakub.weebly.com/uploads/1/3/2/6/132681861/9848603.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414852/normal_5fadd1cfdacf9.pdfIn PDF document text
    • https://tidijerovapo.weebly.com/uploads/1/3/4/3/134342207/71f3c876d93566.pdfIn PDF document text
    • https://lififamofupuge.weebly.com/uploads/1/3/4/3/134317858/sokimose.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367632/normal_5f96c7ab64a4c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388169/normal_5f92441aba7db.pdfIn PDF document text
    • https://tuvonozesafuk.weebly.com/uploads/1/3/4/6/134600303/5541547.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366324/normal_5f8737c6d2795.pdfIn PDF document text
    • https://saxexowiki.weebly.com/uploads/1/3/0/9/130969873/fovun.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380411/normal_5f8ca9cd1c9a0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375341/normal_5f8abe055cabe.pdfIn PDF document text
    • https://farenutatovepo.weebly.com/uploads/1/3/4/5/134502273/5826260.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000f4de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4DE 5428 bytes
SHA-256: 5a79524ace769bba3cb3186ce52a666a21cef66570761481177135dbaceef50d
font_01_sfnt_off0001075e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1075E 11548 bytes
SHA-256: 9c9ef1ea3fcdf66cf782f204b970e99010e51c1b3ee54939e9bff449fab373b1

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