Malicious PDF — malware analysis report

Static analysis result for SHA-256 994c538b608be191…

MALICIOUS

PDF

70.3 KB Created: 2021-03-19 22:48:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: c617dfcf8ced5ae83118ba8bf4eb22c8 SHA-1: 5d0cbbbffe4985792bcd118672bae78217c040fd SHA-256: 994c538b608be191a91d8d64ab4df3a78bb8d94949f197e76bc061528085743c
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://xezojetit.ru/wix?keyword=what+occurs+during+a+decomposition+reaction PDF link annotation
    • http://ridaxaki.mywebcommunity.org/african_american_inventors_worksheet.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4463286/normal_5ff765eb3fdf0.pdfIn PDF document text
    • http://vumexovuvelafe.medianewsonline.com/who_wrote_the_quran_and_when_was_it_written.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489846/normal_5fe2228ac0f74.pdfIn PDF document text
    • https://kitaterikobojim.weebly.com/uploads/1/3/0/9/130969176/zumasejovumexif.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480891/normal_5feaee622e00b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403413/normal_602d2afdea5bf.pdfIn PDF document text
    • https://xorizugabe.weebly.com/uploads/1/3/1/3/131398100/053e1b13b4d961.pdfIn PDF document text
    • https://cdn.sqhk.co/dinigivo/co1eyPl/xoxobodatadotitagatiw.pdfIn PDF document text
    • https://cdn.sqhk.co/winelolibug/ididGOB/ghost_rider_4k_ultra_hd_wallpaper_download.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/polojuliragam/lesumewezonal.pdfIn PDF document text
    • https://s3.amazonaws.com/vuxalirudidel/nujitukamolul.pdfIn PDF document text
    • http://fazaburifug.myartsonline.com/xinofejadawokuz.pdfIn PDF document text
    • https://s3.amazonaws.com/jonora/daily_maintenance_report_template_excel.pdfIn PDF document text
    • https://s3.amazonaws.com/wamatasamegu/goligituzajufixuvigumu.pdfIn PDF document text
    • https://s3.amazonaws.com/mejobu/92576187868.pdfIn PDF document text
    • https://s3.amazonaws.com/rewepalazamiso/ad_blocker_free_chrome.pdfIn PDF document text
    • http://nabafutig.myartsonline.com/65117490325.pdfIn PDF document text
    • http://xenexafa.myartsonline.com/different_types_of_wire_haired_dachshund.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_off0000d448.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD448 5468 bytes
SHA-256: 667fe8e1c70c89e5147704d043020d3e6b94773d734787c7923c26ce00d24b75
font_01_sfnt_off0000e6c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6C2 10796 bytes
SHA-256: b2fea3d01228b505f37ce2fae4f021fadb8ad1810cf556956760e13b9a923037

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