Malicious PDF — malware analysis report

Static analysis result for SHA-256 87f72f13acded494…

MALICIOUS

PDF

76.3 KB Created: 2021-03-19 19:09:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 2bb760ee06925a2358d59b9989fea408 SHA-1: dd446f76b7f559deb259a121482c011350c23b99 SHA-256: 87f72f13acded494314c36d7d54fafe6dead696c9258c15fc0990ee531ac92ce
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous external links, including one to 'leonvi.ru', which is likely part of a link farm or phishing scheme. The document body, though heavily obfuscated, suggests a lure related to 'embedded c objective questions and answers pdf'. The presence of many external PDF links, some pointing to S3 buckets, indicates a potential effort to distribute further malicious content or engage in SEO manipulation for malicious purposes.

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 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://leonvi.ru/award?keyword=embedded+c+objective+questions+and+answers+pdf PDF link annotation
    • http://dedaruk.scienceontheweb.net/muledulijovu.pdfIn PDF document text
    • http://vomimaforotagi.mywebcommunity.org/davizari.pdfIn PDF document text
    • http://matimomewojime.mypressonline.com/fixavigazivukadi.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/vonusirukete/19278514936.pdfIn PDF document text
    • https://s3.amazonaws.com/rivazixexuguri/learning_excel_2007.pdfIn PDF document text
    • https://s3.amazonaws.com/zonivezada/21657333230.pdfIn PDF document text
    • https://s3.amazonaws.com/lomuper/wamaxavogifiboguwamor.pdfIn PDF document text
    • https://3c45aaf8-24f3-4cde-9773-cf44a0a970d3.filesusr.com/ugd/ae7d54_9ea3f92c96694d4ba9c48efe422c7118.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kavifunaruvi/how_many_test_do_you_take_for_cdl_permit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1af01be8-59d8-4354-ae6e-80afa84d54ab/cognitive_psychology_jobs_near_me.pdfIn PDF document text
    • https://s3.amazonaws.com/lazolu/pisutat.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/81017a9a-bacd-4928-b90e-780d4c5e3e31/cant_get_picture_on_samsung_tv.pdfIn PDF document text
    • https://s3.amazonaws.com/dazinibonofobi/crsu_date_sheet_ba_5th_sem.pdfIn PDF document text
    • https://s3.amazonaws.com/daraniwekamidir/lijutuzom.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/37b35fc2-9add-4a07-84e4-0ce5c121673d/control_system_engineering_hasan_saeed_free_download.pdfIn PDF document text
    • https://9387bd13-3746-4408-b474-2867f26e464d.filesusr.com/ugd/ace02d_21896cd24bf94db397a69004f5da88da.pdf?index=trueIn PDF document text
    • http://penanaras.myartsonline.com/beauty_by_jane_martin_symbolism.pdfIn PDF document text
    • https://s3.amazonaws.com/boduxatavepe/jowafateret.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_off0000eb9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB9E 5720 bytes
SHA-256: 8b64b4ce10fc76789fbbc90c60910bf6b4059b61a7d6e78142176eb83715f939
font_01_sfnt_off0000ff13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF13 10880 bytes
SHA-256: 67b7f0523a8fe06cb38b51e021ec2889e97d755a8f163f10822978226de92abb

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