Malicious PDF — malware analysis report

Static analysis result for SHA-256 97578b50b4f41a78…

MALICIOUS

PDF

79.5 KB Created: 2021-05-29 22:52:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 7a6f30a53c1003157433ac6ac46e7b79 SHA-1: 13526c2335f3da516bc7908a9bd34c07f3116e6f SHA-256: 97578b50b4f41a780530a7972f0200e0675fd83271d4a4c9ac6e51182a1257a5
284 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File Execution: User Execution T1059.007 JavaScript: JavaScript

This PDF document is identified as malicious, likely a phishing or social engineering lure. It contains a large number of links to external PDFs hosted on disposable domains, suggesting a link farm or SEO poisoning tactic. The document body, though heavily obfuscated, appears to present a fake error message to trick users into executing commands, consistent with ClickFix attacks. The presence of a malicious redirector URL further supports the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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.
  • 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://yafferge.ru/strik?utm_term=msvcp140.dll+missing+windows+10+error In PDF document text
    • https://mozimokitazipa.weebly.com/uploads/1/3/1/4/131407977/vutunibiw_fedos.pdfIn PDF document text
    • https://likiroji.weebly.com/uploads/1/3/4/5/134526819/647095.pdfIn PDF document text
    • https://renepavavoz.weebly.com/uploads/1/3/4/0/134012855/modutitoki-pupik.pdfIn PDF document text
    • https://pogupevupawigo.weebly.com/uploads/1/3/5/2/135293313/xobininijufasa.pdfIn PDF document text
    • https://kelodulelonax.weebly.com/uploads/1/3/4/6/134644310/4582080.pdfIn PDF document text
    • https://fitulepam.weebly.com/uploads/1/3/0/8/130874207/4214606.pdfIn PDF document text
    • https://kojaresojew.weebly.com/uploads/1/3/4/3/134312518/4317252.pdfIn PDF document text
    • https://wiluxuvofox.weebly.com/uploads/1/3/0/9/130969019/tinobevalokoda.pdfIn PDF document text
    • https://gadudomarun.weebly.com/uploads/1/3/4/7/134705140/gexilozomuged-rabemapadewital.pdfIn PDF document text
    • https://fekobuwag.weebly.com/uploads/1/3/1/8/131858403/bopimirabowamof-gavesuta-rowojoziwor-nelevika.pdfIn PDF document text
    • https://xogepojofaridel.weebly.com/uploads/1/3/2/7/132741214/migimasizu.pdfIn PDF document text
    • https://serofewaz.weebly.com/uploads/1/3/1/3/131379274/4bb8f6c8.pdfIn PDF document text
    • https://gafalevomunu.weebly.com/uploads/1/3/4/2/134235362/puwanafiro-bumasumeker-seniveregil-kuvavolakem.pdfIn PDF document text
    • https://putokosufigaso.weebly.com/uploads/1/3/4/3/134314115/zuzilu.pdfIn PDF document text
    • https://gowubezu.weebly.com/uploads/1/3/4/4/134497845/7277258.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411682/normal_5fe15cf8d4263.pdfIn PDF document text
    • https://tebozelekunoton.weebly.com/uploads/1/3/1/4/131453588/fatumejofimajaz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460060/normal_601fc9ac25758.pdfIn PDF document text
    • https://buxexuwuf.weebly.com/uploads/1/3/4/6/134660927/47c20ab4cda1f57.pdfIn PDF document text
    • https://karopudalel.weebly.com/uploads/1/3/4/8/134881347/9378551.pdfIn PDF document text
    • https://wetikifavuzimol.weebly.com/uploads/1/3/1/6/131606122/kuxujikukefafogularo.pdfIn PDF document text
    • https://zutizogemene.weebly.com/uploads/1/3/5/3/135348028/junimixagen.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_off0000ed25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED25 5656 bytes
SHA-256: d102d3ae2bd58b822b2ba14c2f7b1b0ca026b3b610421acbd8bb0dae43edea34
font_01_sfnt_off00010089.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10089 17612 bytes
SHA-256: 1d973e934c86ea16e1a06f5713e815eae5e5317e143b6a61cea805ae6ba047dc

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