Malicious PDF — malware analysis report

Static analysis result for SHA-256 52b9aebf57a65951…

MALICIOUS

PDF

69.8 KB Created: 2021-02-21 05:51:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-10
MD5: bf8ea360d0d8b66766183347b684f795 SHA-1: 73a92819affd4042bfaa5308e65eab842fa88a76 SHA-256: 52b9aebf57a65951db0223fc390ef4288bc5b65052318542d3ee15a37e1d5348
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links pointing to other PDFs hosted on disposable domains, a common tactic for SEO manipulation or phishing. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution via these linked documents. No scripts were extracted, but the PDF structure itself is indicative of a malicious link farm.

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
  • 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/wix?keyword=secondary+economic+activities+in+dublin PDF link annotation
    • https://jabevemejo.weebly.com/uploads/1/3/1/4/131483275/1743102.pdfIn PDF document text
    • https://gejodawutu.weebly.com/uploads/1/3/1/1/131164152/reduluwunozuwo_zomiwe_nagus_mabavik.pdfIn PDF document text
    • http://twenty-promo2020.ru/sex_and_the_city_on_netflixakqh2.pdfIn PDF document text
    • https://benejawu.weebly.com/uploads/1/3/4/1/134131543/5909840af4.pdfIn PDF document text
    • https://jiwepurojal.weebly.com/uploads/1/3/0/7/130775762/b24f3b8b.pdfIn PDF document text
    • https://vojubewerele.weebly.com/uploads/1/3/4/0/134013512/ad985143.pdfIn PDF document text
    • https://bitigufej.weebly.com/uploads/1/3/5/3/135337089/89a603ce1906b4.pdfIn PDF document text
    • http://scrlt.xyz/73841123137ba2ng.pdfIn PDF document text
    • https://sonujeti.weebly.com/uploads/1/3/0/9/130969686/rusaniriri-porogo-bodezeg-kerolu.pdfIn PDF document text
    • https://goruwikok.weebly.com/uploads/1/3/4/7/134740681/b0a120a37256c.pdfIn PDF document text
    • https://polaposegit.weebly.com/uploads/1/3/4/5/134591324/848e5e4de06855.pdfIn PDF document text
    • http://differencecheats.net/bonumikuto9zhrf.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/wazotojemov/a_thousand_years_instrumental_audio.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_off0000d4a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4A3 5492 bytes
SHA-256: 05282df98c0eefdbb046a7051de9858e145c5e11782583510d3344de888fdbd4
font_01_sfnt_off0000e744.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE744 10312 bytes
SHA-256: ac3909a1e72ca26a208e37f7104a1e18df0df1abdeb2f1b1ffb44636eebcacab

Open this report in the interactive analyzer, or submit your own file for analysis.