Malicious PDF — malware analysis report

Static analysis result for SHA-256 a528f53ae9bbf9b2…

MALICIOUS

PDF

69.2 KB Created: 2020-11-13 08:05:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 4fc3d136661a909b7fa9a16501e49749 SHA-1: 7645fa6e3b28b7f5ab7d8e7832c1437406c4c617 SHA-256: a528f53ae9bbf9b225340883a6eda387987a1cdbda263196af9cb7ea660494e8
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link T1059.007 JavaScript

This PDF file was identified as malicious by multiple heuristics and a machine learning classifier, including detections for malicious redirector links and a link farm. The embedded URLs, such as 'https://cctraff.ru/123?utm_term=cathy+zhang+upenn', suggest an attempt to redirect users to potentially harmful content. The presence of numerous links to external PDFs indicates a strategy to distribute or host malicious content across various domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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/123?utm_term=cathy+zhang+upenn In PDF document text
    • https://xalipifizipig.weebly.com/uploads/1/3/1/3/131379045/gejikekibe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408471/normal_5f9417725b095.pdfIn PDF document text
    • https://logekififej.weebly.com/uploads/1/3/4/5/134502341/4684e8fd.pdfIn PDF document text
    • https://dodilepu.weebly.com/uploads/1/3/4/4/134444379/gukugowesoji.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371025/normal_5f927097b6d42.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463526/normal_5fa8900cee49d.pdfIn PDF document text
    • https://luwobidope.weebly.com/uploads/1/3/0/8/130814225/kisusovimogax-xagonujobed-wejakimemubumix-povojavibik.pdfIn PDF document text
    • https://lifotuvuzaraxur.weebly.com/uploads/1/3/0/7/130775275/zaluvisonagepewevufe.pdfIn PDF document text
    • https://lupolaluxu.weebly.com/uploads/1/3/2/6/132681144/20d8b.pdfIn PDF document text
    • https://bexitapanirid.weebly.com/uploads/1/3/0/9/130969950/viluvobosuve-viranipa-pamebu-wajaliweriwox.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458837/normal_5fa7b7b66cf0c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388181/normal_5fa9250c10fab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370541/normal_5f94b26b816ce.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/widofafane/losaxowuzedozebetajofa.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_off0000d18f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD18F 4832 bytes
SHA-256: 6ef1767877eca01bfbe700418808f7014c12ef69d7521f3c5c03f6343074402b
font_01_sfnt_off0000e211.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE211 11260 bytes
SHA-256: 54820bda9f1ea4bd4214410321da13204fe5319f00279fea6b80b431535f19db

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