Malicious PDF — malware analysis report

Static analysis result for SHA-256 001094b65673b074…

MALICIOUS

PDF

70.5 KB Created: 2021-02-17 00:28:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: f916ccca316219e4f825f556508e3d17 SHA-1: afc8b03217b57433d3b5527c2845c307bcffc077 SHA-256: 001094b65673b074c543922d51ba7e5751c2f8ff8685d3a1315d381fc1fd6947
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to potentially malicious redirectors or link farms, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK and PDF_SEO_LINK_FARM heuristics. The ML classifier and ClamAV also flagged this file as malicious. The document body, though heavily obfuscated, suggests a lure related to educational materials or application forms, aligning with phishing or malware distribution tactics.

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
  • 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.
  • 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=essential+elements+for+ukulele+-+method+book+1 In PDF document text
    • https://salexutoxor.weebly.com/uploads/1/3/4/7/134761189/b60a5a5e106.pdfIn PDF document text
    • http://design-kvartira.info/92300567342egwdx.pdfIn PDF document text
    • http://moneyindia.site/22356632697s54i9.pdfIn PDF document text
    • http://oneplusonemain.xyz/xuwusewm20bw.pdfIn PDF document text
    • https://rororejiwep.weebly.com/uploads/1/3/5/9/135966539/5559114.pdfIn PDF document text
    • http://coupons2020.info/pijinaruxovofekesmccuu.pdfIn PDF document text
    • https://vawixufedal.weebly.com/uploads/1/3/0/8/130814584/rikuzabunusuvu.pdfIn PDF document text
    • https://wafulezejo.weebly.com/uploads/1/3/4/7/134748518/puwetasutekokefogubo.pdfIn PDF document text
    • https://binufigelivu.weebly.com/uploads/1/3/4/7/134775083/potesidukobonol-kaditajewazezap-zemugokaje.pdfIn PDF document text
    • http://arthromedro.xyz/fadifuburawuzxl3c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://gasanilu.epizy.com/dlsu_application_form_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/juzewojavomofew/rajinotikodomometiwa.pdfIn PDF document text
    • https://s3.amazonaws.com/fapaga/29154541131.pdfIn PDF document text
    • http://rufevobovejexe.rf.gd/janolazabobuw.pdfIn PDF document text
    • https://s3.amazonaws.com/jotizifime/xibokezupa.pdfIn PDF document text
    • http://pomigipasa.epizy.com/woxavemov.pdfIn PDF document text
    • https://s3.amazonaws.com/vobuturinivi/facebook_messenger_video_call.pdfIn PDF document text
    • https://s3.amazonaws.com/kubedukowug/78783182571.pdfIn PDF document text
    • https://s3.amazonaws.com/nabifovu/89583026470.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c7f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7F6 5272 bytes
SHA-256: 82cbdc532a1c77b95f0d1c74dd000096b256c9e5756e3a86ba6639072fa98b85
font_01_sfnt_off0000d9b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9B8 10308 bytes
SHA-256: a9e1a56d46056b164cf9bff7a6b0ac9c79aec0387791b02106b6099afc47bb4b
font_02_sfnt_off0000fcd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCD0 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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