Malicious PDF — malware analysis report

Static analysis result for SHA-256 88d889f1584a47a9…

MALICIOUS

PDF

75.9 KB Created: 2021-03-18 06:19:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 81c695ba081842761ddb11da31253073 SHA-1: 926f094e7955054d9c1f6f44ecf112860ed20e1c SHA-256: 88d889f1584a47a9f60605eaf0d6cb680a3cebc74a2d51400c880fc53923c2d9
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a primary focus on a URL that appears to be part of a link farm designed to mimic search results. ClamAV and ML classifiers strongly indicate maliciousness, specifically flagging it as phishing or a trojan. The presence of embedded URLs and the heuristic 'PDF_SEO_LINK_FARM' suggest the document's purpose is to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://lozipotod.ru/award?keyword=srs+for+attendance+management+system+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4481272/normal_600ce220c900a.pdfIn PDF document text
    • https://kaxawoxo.weebly.com/uploads/1/3/1/0/131070710/vegapuwefazupo.pdfIn PDF document text
    • http://frontend-developer-azaynullin.site/20524622290jhbq0.pdfIn PDF document text
    • http://rubeatyshop.xyz/zofegagebifodfn3l.pdfIn PDF document text
    • https://zabugejagovim.weebly.com/uploads/1/3/1/6/131637755/ec502dcaff26e05.pdfIn PDF document text
    • http://winoorama.website/xavokutunokowunirux16lbr.pdfIn PDF document text
    • https://matexofetuboso.weebly.com/uploads/1/3/1/4/131453592/6711922.pdfIn PDF document text
    • http://jsexj.fun/keralebg629.pdfIn PDF document text
    • https://pejudipevunasu.weebly.com/uploads/1/3/5/3/135351173/7f424727bcd.pdfIn PDF document text
    • https://kafasomawupi.weebly.com/uploads/1/3/0/7/130775431/aea2d.pdfIn PDF document text
    • http://cryogen.me/jorukesivarapedojosumolavxqett.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491969/normal_603e6298b9f34.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/fuwuzerijofa/damowigutanowa.pdfIn PDF document text
    • https://s3.amazonaws.com/mefadedosuw/does_google_chrome_have_flash_built_in.pdfIn PDF document text
    • https://s3.amazonaws.com/vogubivajavofu/jopusone.pdfIn PDF document text
    • https://s3.amazonaws.com/jijari/readworks._org_answer_key_grade_6.pdfIn PDF document text
    • https://s3.amazonaws.com/vedexajawo/30607883797.pdfIn PDF document text
    • https://s3.amazonaws.com/mijumomub/liwedogodonagexidepobaron.pdfIn PDF document text
    • https://s3.amazonaws.com/sefabe/16814319905.pdfIn PDF document text
    • https://s3.amazonaws.com/vavejijitatofu/buranegudotutarexudixez.pdfIn PDF document text
    • https://s3.amazonaws.com/zaxawetawupo/makewarakasogi.pdfIn PDF document text
    • https://s3.amazonaws.com/vazisi/zukepipodafobetowuvaxowu.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_off0000eba5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBA5 5648 bytes
SHA-256: dea7074580c53c2b8019748f3ca99826b295ad492b09ae730998489c90fac0d0
font_01_sfnt_off0000fed6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFED6 10556 bytes
SHA-256: a561956c351820f44b740535bef19da9e5cdacc9fd33e97893c8c06967620994

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