Malicious PDF — malware analysis report

Static analysis result for SHA-256 dabb97909455d0ee…

MALICIOUS

PDF

77.0 KB Created: 2021-05-23 01:15:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f82781194e826e770db315748a32080c SHA-1: d6fd28d0f3e32a87da513b4cc10eea4533c55ee0 SHA-256: dabb97909455d0ee3ca0ed4542ea53b52e9b870ffd2f8c77aa11f42c898ede57
196 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to other PDFs, suggesting a link farm or SEO poisoning tactic to distribute malicious content. The presence of a ClamAV detection for 'Pdf.Phishing.Trojan' and ML classification strongly indicate malicious intent. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' suggests the document may be part of a multi-stage attack where a password is provided to decrypt a payload, further obfuscating the malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • 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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://midufefew.ru/strik?utm_term=how+to+change+playback+speed+on+spotify+web+player
    • https://static.s123-cdn-static.com/uploads/4502248/normal_5fcb1ff4b99ca.pdf
    • https://befapoge.weebly.com/uploads/1/3/1/6/131637854/5502813.pdf
    • https://newavutija.weebly.com/uploads/1/3/1/8/131871734/94252.pdf
    • https://linefalaxig.weebly.com/uploads/1/3/2/6/132682404/foxute.pdf
    • https://static.s123-cdn-static.com/uploads/4381528/normal_5ff423cfc98e5.pdf
    • https://static.s123-cdn-static.com/uploads/4496225/normal_5fc8263f82022.pdf
    • https://zojipulororasa.weebly.com/uploads/1/3/6/0/136011419/gaxaxifoxowofun.pdf
    • https://kavekoda.weebly.com/uploads/1/3/5/3/135326791/2d581e46783ace.pdf
    • https://cdn-cms.f-static.net/uploads/4426424/normal_606bbe1acf9c9.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/tifuwuw/cool_jazz_font_free_for_android.pdf
    • https://s3.amazonaws.com/kubedukowug/50514189648.pdf
    • https://s3.amazonaws.com/jeromisixinolib/92433657265.pdf
    • https://s3.amazonaws.com/ronatiduzoxij/reked.pdf
    • https://s3.amazonaws.com/sosupejuxofedo/xekewi.pdf
    • https://s3.amazonaws.com/pesetufavo/kelanoranope.pdf
    • https://uploads.strikinglycdn.com/files/00f4bd0d-dd92-4c4e-9eac-2ed70de14b6c/is_mando_a_real_mandalorian.pdf
    • https://s3.amazonaws.com/jeromopelurab/58486836688.pdf
    • https://uploads.strikinglycdn.com/files/f885f145-85b4-4d50-9173-9ee0dba8e6c1/xowip.pdf
    • https://uploads.strikinglycdn.com/files/5df61a2a-9e8f-4bda-bbf9-e0301b189bf4/computer_dummies_books.pdf
    • https://s3.amazonaws.com/nijosinizo/free_sheet_music_sites.pdf
    • https://s3.amazonaws.com/fizup/password_protect_acrobat_reader_dc.pdf
    • https://s3.amazonaws.com/gurafoga/jakelus.pdf
    • https://s3.amazonaws.com/nowonovege/blackpink_whistle_english_version.pdf
    • https://s3.amazonaws.com/sezewu/vafafevubabufaxisibu.pdf
    • https://uploads.strikinglycdn.com/files/5e675c44-b4e5-4a91-a70f-f3e78193a278/jajobejoxezoxabimezo.pdf
    • 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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ecfb.bin
114a98c92e5d90a246a68f83e2db4ba83246156922668d65371790ce2c7b15d9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xECFB 5776 bytes
font_01_sfnt_off000100b1.bin
447673242958bfff0dfc3e9e06e90c1afbe9a411cc8d08fcbcdef7e9253a0a2d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x100B1 10928 bytes

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