Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c33756516ec4766…

MALICIOUS

PDF

73.2 KB Created: 2021-05-18 05:49:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 05d2ec6b18d7faa84ada372648722966 SHA-1: 78ea30876e7993f0fcf446f8d46d3eeb347fe7e9 SHA-256: 6c33756516ec476638fcd8f7576628e59cfea8ff42e6d5de203683682d75596f
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The file contains a large number of external links, many pointing to disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. One prominent URL, https://jottigo.ru/strik?utm_term=estee+lauder+double+wear+foundation+colour+guide, is presented as a "colour guide" to lure victims.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jottigo.ru/strik?utm_term=estee+lauder+double+wear+foundation+colour+guide PDF link annotation
    • https://sakavafufegig.weebly.com/uploads/1/3/5/3/135323197/6e77fe5eec0da3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490722/normal_5ff76b17d9be6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4499999/normal_6053b68f46286.pdfIn PDF document text
    • http://kuvelopomegemes.iblogger.org/xomezegatinebojude.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414678/normal_6068ae3a42419.pdfIn PDF document text
    • https://naworetomepixi.weebly.com/uploads/1/3/7/5/137504938/f5368eca55.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465704/normal_60353a83b24b0.pdfIn PDF document text
    • https://gadepututam.weebly.com/uploads/1/3/5/3/135325389/teginaxevabanes_riwafax.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375891/normal_606b0b9a03c74.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410679/normal_5fe222623f785.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417039/normal_603d2e52c3ff4.pdfIn PDF document text
    • https://ponawexem.weebly.com/uploads/1/3/2/7/132740185/pudekum_zetuzekijune_juxesowag_bebegazeretu.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/lorugipopuxe/88871474379.pdfIn PDF document text
    • https://s3.amazonaws.com/xidulumexi/what_happened_at_the_end_of_the_mist.pdfIn PDF document text
    • http://zuxekesimulir.epizy.com/ifrs_15_guide_deloitte.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_off0000de05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE05 5380 bytes
SHA-256: da8180d093ec2adaf28d4451fca1a5cc08b136cef59c4a9b59f419827b5dc5a2
font_01_sfnt_off0000f072.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF072 10988 bytes
SHA-256: d8d8bc9297920ab5af2d17436a13a4a8b384997807a4277e6c48621ef7e41b20

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