Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae5361ef13c74fee…

MALICIOUS

PDF

71.9 KB Created: 2021-02-15 15:53:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 9d2ee479c79bc4eb207f30a07b420e36 SHA-1: 130872dd40f56aa76270e682b66cae9d5ca2418d SHA-256: ae5361ef13c74fee5f4ab66d096d2639d7071c5cc58671d444eb89fdcdfae18d
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO poisoning tactic. The embedded content appears to be a lure, using a search query as a pretext to direct users to malicious websites. While no scripts were explicitly extracted, the PDF structure and numerous external links indicate an attempt to redirect users to potentially malicious content or download further payloads.

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://baarspo.ru/wb?keyword=does%20sonos%20work%20with%20record%20player PDF link annotation
    • http://noverst.xyz/unlimited_free_vpn_betternet_androiduunwn.pdfIn PDF document text
    • https://cdn.sqhk.co/joninopi/hnSRieg/old_keyboards_are_for_sale_on_the_internet.pdfIn PDF document text
    • https://dosaremuxabibi.weebly.com/uploads/1/3/0/7/130739916/dijemipufo-kovaduzu-gumomafese-valinajo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367919/normal_5fd7d58daf0bc.pdfIn PDF document text
    • https://zadavutuni.weebly.com/uploads/1/3/4/3/134343582/dd65f.pdfIn PDF document text
    • https://gagufivelorifig.weebly.com/uploads/1/3/4/5/134596616/worenowijosu.pdfIn PDF document text
    • http://fastcreditreport.info/sakebiz31bzh.pdfIn PDF document text
    • https://gelatotagubas.weebly.com/uploads/1/3/0/8/130813077/letonokawi-totizuzusafowu-wutonoge.pdfIn PDF document text
    • https://xomuxojevasew.weebly.com/uploads/1/3/4/0/134096468/8dd7f47d2532aa4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464311/normal_5fe8b57c6d6d8.pdfIn PDF document text
    • https://xakirajurupani.weebly.com/uploads/1/3/2/3/132303083/32b4ee3e160cef.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369786/normal_5fc5943606354.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450355/normal_5febfc6637c95.pdfIn PDF document text
    • http://nowtorrentz.com/filmorago_free_pc230ks.pdfIn PDF document text
    • http://apsmall.space/bebiji4rd0.pdfIn PDF document text
    • https://jaradaka.weebly.com/uploads/1/3/0/8/130813635/babedawazipokebes.pdfIn PDF document text
    • http://money-team.site/fuvafederuxotadolxv4c.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_off0000dc89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC89 5416 bytes
SHA-256: fb306775ada328d50e33d77a96b0a6954482db8271418b0885f40a10b0aa9072
font_01_sfnt_off0000ef10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF10 10396 bytes
SHA-256: b80594781267fdfbe8c3412c0574e7087efd352e53bb511968916c6ba35832f0

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