Malicious PDF — malware analysis report

Static analysis result for SHA-256 61075060d3aa7f12…

MALICIOUS

PDF

91.2 KB Created: 2021-03-23 09:33:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bad92765be68d207ed11b2e0a197039d SHA-1: 758466b31ec2b9c5740badc14a0cac916e3b755f SHA-256: 61075060d3aa7f12c0aa5188248a20f05214d873d6dd7c593b289055b2569a1e
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to other PDF files, suggesting a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and extensive external linking are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://xezojetit.ru/award?keyword=basic+integration+formulas+pdf+download
    • https://static.s123-cdn-static.com/uploads/4444377/normal_6007267985e25.pdf
    • https://zunexoxefa.weebly.com/uploads/1/3/5/3/135340588/bajiruzukumino.pdf
    • https://cdn.sqhk.co/pelopuxi/idX4Whg/foldersync_alternative_app.pdf
    • https://cdn.sqhk.co/piwuzuberaze/gggjihj/64509425942.pdf
    • https://cdn.sqhk.co/zaniridut/dXhgijj/basketball_court_size_elementary_school.pdf
    • https://static.s123-cdn-static.com/uploads/4492536/normal_5fcaf40bb418c.pdf
    • https://cdn-cms.f-static.net/uploads/4487626/normal_60391c2870431.pdf
    • https://rebodegumirimak.weebly.com/uploads/1/3/0/7/130775130/zufanaziz.pdf
    • https://static.s123-cdn-static.com/uploads/4374848/normal_5feb4214ab5bc.pdf
    • https://cdn-cms.f-static.net/uploads/4453560/normal_5fd6814a7d42f.pdf
    • https://cdn.sqhk.co/xubipoxeguza/ieHNijs/anime_with_robots_and_aliens.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://19a39513-20cc-49d1-a75c-e30ce0314142.filesusr.com/ugd/f99735_600b721ab253402388e4b40919389768.pdf?index=true
    • https://e60c805d-b9e1-47fc-b045-983511e9ac1f.filesusr.com/ugd/116bb2_88731603adde4854ad94ea4bd36d47e2.pdf?index=true
    • http://keluwuvofaj.epizy.com/9660430135.pdf
    • http://fiwixowu.rf.gd/piriformis_muscle_compressing_the_sciatic_nerve.pdf
    • https://4a39c6c9-989b-4d11-b2d8-cc0becc7f193.filesusr.com/ugd/ef0078_48f847556cc045818a994d756fd8af5b.pdf?index=true
    • https://204833c8-abda-4421-8777-5048ee7dd919.filesusr.com/ugd/e30b7a_a3069c20bdf849b2bed8438f96ed6f7e.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • https://savannah.gnu.org/projects/freefont/
    • http://www.gnu.org/licenses/
    • http://www.gnu.org/copyleft/gpl.html
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fb4a.bin
343628acd0d60a7873d37c2d1bef09f845024422680273c23a4c3ae649893e5a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB4A 7292 bytes
font_01_sfnt_off00010e0c.bin
3f4d5d0b5c4efee3aa268c9867e57383b3ea0065fea303d8d0fb85ff9a877873		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10E0C 5616 bytes
font_02_sfnt_off00012121.bin
ae88a17ecd985356c404fac9b0a3ce7cb95568fd20dda6b6c8d3911d5a329589		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12121 11800 bytes
font_03_sfnt_off000149e9.bin
bc1c1644e30597ae0beaac312b9749a82b64e26c109397326cdc67fdbaf2fe17		 pdf-font-stream PDF embedded font (sfnt) at offset 0x149E9 16036 bytes

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