Malicious PDF — malware analysis report

Static analysis result for SHA-256 23a23a7839e89a4b…

MALICIOUS

PDF

80.9 KB Created: 2021-02-25 02:25:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: ea2bce8e04662754218e21ff0d1592e9 SHA-1: c9a1dd0fa36b07ae5948f7f43130bb72244a6419 SHA-256: 23a23a7839e89a4b672d7337616b86419e10ff8dc595be55bde1c07243909854
126 Risk Score

Malware Insights

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

The PDF contains numerous external URIs, with one specifically identified as a link farm hosted on disposable infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The presence of embedded URLs and the heuristic flagging it as a link farm suggest the primary goal is to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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/award?keyword=ruger+lcp+pocket+holster+no+print PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4403804/normal_6026dff387dec.pdfIn PDF document text
    • http://tryne.xyz/51327551063mo8ey.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4497369/normal_5ffb508a0a9aa.pdfIn PDF document text
    • http://telemprom.xyz/tudijapabusodotidufupinagibp6d.pdfIn PDF document text
    • http://datifuxevewa.22web.org/atlas_of_foraminifera.pdfIn PDF document text
    • http://stavki-na-sport.site/why_isnt_america_the_greatest_country_in_the_world_anymore76j0w.pdfIn PDF document text
    • https://negozikazaseju.weebly.com/uploads/1/3/4/5/134587396/kepuzenuxawemib-zukameroka-tafaxij.pdfIn PDF document text
    • https://sinukunub.weebly.com/uploads/1/3/4/4/134431456/b2d6b14c4.pdfIn PDF document text
    • http://septiki-rf.website/fewiburumumra2h.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4528876/normal_5fc6cc043626c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411915/normal_5fcd81732f3c8.pdfIn PDF document text
    • http://xufubub.iblogger.org/menajibegigipoda.pdfIn PDF document text
    • http://idealicacolumbia.site/2261677860frws3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368230/normal_5fe9f1bfe0ad0.pdfIn PDF document text
    • https://rasisepuwefu.weebly.com/uploads/1/3/4/6/134678142/cbfe0229053b7.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/bisute/lokefudisuzok.pdfIn PDF document text
    • https://s3.amazonaws.com/diwitapezu/14549749420.pdfIn PDF document text
    • http://tenurusimuxu.epizy.com/kuwakexunefekosajoxemimed.pdfIn PDF document text
    • https://s3.amazonaws.com/widiku/59440675110.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_off00010193.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10193 5056 bytes
SHA-256: ed6817898e7c2fb6890caad2e2791d7a826e8e05155605201ac3042c2b8dd710
font_01_sfnt_off000112ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112CE 10360 bytes
SHA-256: 6c89a965fc759799d25e404ae2043b9a6a72239ab200a4a7acaf40d18cd7ba3e

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