Malicious PDF — malware analysis report

Static analysis result for SHA-256 db0e9aa5436ae5e2…

MALICIOUS

PDF

68.9 KB Created: 2021-03-03 09:29:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: bef44dec912e67b15c242518c9641c84 SHA-1: 17acee8fc11e68e92788a910c208f0e94d41abb6 SHA-256: db0e9aa5436ae5e2e172d05049a087e036e528739fdbaddfdb4b20f28e456c54
134 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://xajibur.ru/wix?keyword=the+skin+i%2527m+in+pdf+download PDF link annotation
    • http://monongzhlh.space/vivid_navigation_gestures_apkqfam0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421342/normal_5fe89dfb34b7d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382613/normal_60280bc18a4a8.pdfIn PDF document text
    • http://armada.technology/bofutotasiwopezilirugovd4xgx.pdfIn PDF document text
    • http://tevuvisena.iblogger.org/71558929991.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413719/normal_60043151168dd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490256/normal_601a7180afdd0.pdfIn PDF document text
    • http://instapriz24.site/wuxaduxufu91ql3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455198/normal_600a55c02b8c4.pdfIn PDF document text
    • http://stavki-na-sport.site/84375704444uov0h.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493553/normal_600fe1abf1881.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476140/normal_5ff30b00e118c.pdfIn PDF document text
    • http://mx50off.pro/sabaribowulanoxupka5g.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://duxegejuw.atwebpages.com/80836721486.pdfIn PDF document text
    • http://bifameb.rf.gd/50695273437.pdfIn PDF document text
    • http://rafedorexi.epizy.com/fofujofopajitaketadif.pdfIn PDF document text
    • http://nibejodawugizex.rf.gd/62669607125.pdfIn PDF document text
    • http://zubiluwetij.myartsonline.com/juzusizapeluli.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_off0000d10e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD10E 5324 bytes
SHA-256: 77364c5458d15d85c91d05de16825ccc365563d868f5843b9874b7d572ae3608
font_01_sfnt_off0000e31c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE31C 10316 bytes
SHA-256: 53aae80189961b80120828e1e63bb314d42bf28687520d21390ccbed1e966e50

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