Malicious PDF — malware analysis report

Static analysis result for SHA-256 38aaa8c803361fe8…

MALICIOUS

PDF

82.5 KB Created: 2021-05-30 04:17:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 8c69d197c9627b269aac308e79fd8391 SHA-1: d29a1cedd1a88092f7bef3dae6e775c02f2c03af SHA-256: 38aaa8c803361fe8e885223f172ab3004f3b6ee104c9a92986b9b7fd69121075
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or phishing campaign. The document body, though heavily obfuscated, appears to be a lure related to 'coloring images of transport'. No scripts were extracted, but the presence of numerous external URLs strongly suggests the document's purpose is to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://druttle.ru/strik?utm_term=imagenes+de+medios+de+transporte+terrestre+aereo+y+maritimo+para+colorear PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4409107/normal_6030a06979950.pdfIn PDF document text
    • https://leguwilevifemat.weebly.com/uploads/1/3/4/5/134595517/zupipovewevapugo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447097/normal_60175f448d59f.pdfIn PDF document text
    • https://jufujepil.weebly.com/uploads/1/3/4/6/134650130/dagaso.pdfIn PDF document text
    • https://dexanefuv.weebly.com/uploads/1/3/1/3/131383512/jowerupu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425929/normal_602d5d43eadb7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415543/normal_6035a92dc1695.pdfIn PDF document text
    • https://lemosipezo.weebly.com/uploads/1/3/5/3/135326275/suxajonimono.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421637/normal_605c279645e4d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413005/normal_604ddb9e649e3.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4485580/normal_60b2bfdf13249.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478669/normal_600d00d33c8bf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485015/normal_5ffae885ac6e6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407804/normal_60201ac46d508.pdfIn PDF document text
    • https://sirakogosi.weebly.com/uploads/1/3/4/6/134600403/7671021.pdfIn PDF document text
    • https://rexavinuzuna.weebly.com/uploads/1/3/4/3/134308075/8cf9c8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500665/normal_602d3fe27b2ee.pdfIn PDF document text
    • https://lamuwibosuzo.weebly.com/uploads/1/3/1/0/131071033/282888.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425235/normal_606532c0f1850.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485149/normal_5fdd863886249.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4427077/normal_5ff8b14743b23.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375353/normal_5ffdea5d9a546.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368245/normal_603976c0edccc.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_off000104c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104C7 5432 bytes
SHA-256: 0ffd9f073f01b8027c2e898dd3ae89e5d729d524c7c8e3207d21760de468a43d
font_01_sfnt_off0001172f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1172F 10988 bytes
SHA-256: 83ddcfa6ac68357503d3260a5625dc05867fa66af6475f786af94513274e594f