Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce113e81729978f5…

MALICIOUS

PDF

70.7 KB Created: 2021-03-29 04:33:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 30fe8a0ce25cd978f84de2da1761eeec SHA-1: 7d242283c9b748a73e361e3f3c901dad07c96405 SHA-256: ce113e81729978f583d3b8cee27776e981087d0b15fe66fbf0fe18bd83d6c8a3
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 of which are hosted on disposable domains, indicating a link farm designed for SEO manipulation or malicious redirection. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The embedded URLs and the heuristic findings point towards a tactic of using a seemingly innocuous document to drive traffic to potentially harmful sites.

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://botokaw.ru/strik?utm_term=pdf+architect+7+free+download PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4405430/normal_601881d40c4b0.pdfIn PDF document text
    • https://pusudojajepi.weebly.com/uploads/1/3/5/3/135322366/razosigese-baxavu-xazoxi-menemumupubufa.pdfIn PDF document text
    • http://gisisavodure.22web.org/camera_app_for_android_9.pdfIn PDF document text
    • https://cdn.sqhk.co/polirorenu/XhibWjh/family_guy_the_quest_for_stuff_apk_mod.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487201/normal_6028f4e60b198.pdfIn PDF document text
    • https://cdn.sqhk.co/gazegarov/62hjJji/ribexarilavike.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470980/normal_60601bd89c1f6.pdfIn PDF document text
    • https://cdn.sqhk.co/gadewekunel/wzaCqhc/cinemark_entertainment_stock.pdfIn PDF document text
    • https://cdn.sqhk.co/bidelefo/je9jjbr/88757562972.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4496005/normal_5fca12381f2c4.pdfIn PDF document text
    • https://cdn.sqhk.co/nadudegimew/aehfgee/internet_marketing_business_for_sale.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447252/normal_5fe2ce1ae584b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500678/normal_60219954a3236.pdfIn PDF document text
    • https://butegipabozu.weebly.com/uploads/1/3/4/2/134235803/3707343.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487918/normal_6052a28da5e55.pdfIn PDF document text
    • https://sedovabopidixo.weebly.com/uploads/1/3/0/8/130813108/taworol.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dalefiza.rf.gd/50459870820.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_off0000d810.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD810 5104 bytes
SHA-256: 35e4a054ff3c21b22f59749962d56a0bb89ffd9192b7cbf64981b7d19cfa7746
font_01_sfnt_off0000e987.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE987 10740 bytes
SHA-256: 2450fd6a329ca195fb685779f4122433e374bd8fed99a313a528e29efb3bfd7b

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