Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d6aa4095f0db231…

MALICIOUS

PDF

71.2 KB Created: 2021-03-04 20:15:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: de692cd16080b4c2a135e3c1e0f39fec SHA-1: 3a036aded080cce87a5e0e854e2e64dff12d12d6 SHA-256: 4d6aa4095f0db231cf7d2d9c8619032199816d1048d7080dee4c172a0489e3f2
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which are hosted on file-sharing services and appear to be part of a link farm. The primary URL, 'https://golowaki.ru/award?keyword=is+snape+a+bad+guy+in+harry+potter', suggests a lure related to search engine optimization or content manipulation. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for distributing further malware or phishing content.

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://golowaki.ru/award?keyword=is+snape+a+bad+guy+in+harry+potter PDF link annotation
    • https://zetitazafoxiz.weebly.com/uploads/1/3/4/0/134040412/nokunu.pdfIn PDF document text
    • https://benejawu.weebly.com/uploads/1/3/4/1/134131543/bimetija-sigop-xazexage-xokigalime.pdfIn PDF document text
    • https://tigibivimibi.weebly.com/uploads/1/3/4/3/134344299/4357940.pdfIn PDF document text
    • https://koxipaburejoxow.weebly.com/uploads/1/3/2/6/132681725/nuzadijibop.pdfIn PDF document text
    • https://lirobepofuneve.weebly.com/uploads/1/3/0/7/130740173/puvudul.pdfIn PDF document text
    • https://fegemuvu.weebly.com/uploads/1/3/2/6/132695633/4927293.pdfIn PDF document text
    • https://lelodudovoveju.weebly.com/uploads/1/3/1/6/131607117/4666946.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/nafibanefexex/opera_browser_for_pc_windows_10.pdfIn PDF document text
    • https://104e0e48-a4c2-4a03-8647-06ef64d4e6ac.filesusr.com/ugd/e2c6c1_10848831c14142bbb0cbd1d693e1a736.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tezofuretejom/31239509123.pdfIn PDF document text
    • https://s3.amazonaws.com/jefobexapulow/bhai_film_video_songs.pdfIn PDF document text
    • https://s3.amazonaws.com/banula/the_last_samurai_ujio_battle_cry.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c40dc1ed-b390-4ba4-888e-c28982e071d0/ximegosibomekal.pdfIn PDF document text
    • https://07d68bf2-0661-47e2-9ffe-eae068a071af.filesusr.com/ugd/fef806_0c20dad601e747c09d867cf90cf4d4fd.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/muvemasoxaji/33767466523.pdfIn PDF document text
    • https://s3.amazonaws.com/vipuxafol/dinodejukedokisexakevige.pdfIn PDF document text
    • https://s3.amazonaws.com/jupudizadid/fulalemisaneretejulopev.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8a73c9cd-e59c-42de-a11d-d6fb823d37c7/inkscape_trace_bitmap_not_working.pdfIn PDF document text
    • https://54d25d35-1219-4e5f-97c3-905e72ea606f.filesusr.com/ugd/6d59ab_2071e4a2054841d59726825d524a2d95.pdf?index=trueIn PDF document text
    • https://d6b7b3c7-8429-4d82-9d75-5d5d09e763cc.filesusr.com/ugd/a8c229_c9f04b2b3e634b52926f56f421081bf5.pdf?index=trueIn 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_off0000db9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB9C 5368 bytes
SHA-256: 72121027c9da6c41d06f5fc6cfe87b940a3adbf0d959edce664d6b3388cfcef2
font_01_sfnt_off0000edd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDD4 9888 bytes
SHA-256: ad373cb366dd93ac7175baa13d92102f38c48ab0085d6415b158204ae238e48f

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