Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d2d3a16a1b232e8…

MALICIOUS

PDF

81.5 KB Created: 2021-06-12 02:10:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d79cbea5e4fb45194d7cbc0015973f7c SHA-1: 4e122bfc046455444128b2aec6c35f54494da44c SHA-256: 2d2d3a16a1b232e8a5a5f5360913e6f95e500d8b6f36eb07554043da5dbd8387
164 Risk Score

Malware Insights

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

The file is a PDF that contains a large number of external links, many of which point to PDFs hosted on file-sharing services. The ClamAV detection and ML classifier strongly indicate maliciousness, likely related to phishing or malware distribution. The presence of a "download button" heuristic further supports a lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://pistant.ru/pbw?utm_term=playing+card+psd+template
    • https://dovoviwum.weebly.com/uploads/1/3/0/7/130776035/totuvujaf.pdf
    • https://labaveboto.weebly.com/uploads/1/3/4/6/134611097/879843a4.pdf
    • https://nesavelo.weebly.com/uploads/1/3/2/3/132303009/lubezelemopu.pdf
    • https://kifitakuridugiv.weebly.com/uploads/1/3/4/7/134770331/kipojugovaposumebas.pdf
    • https://galibemad.weebly.com/uploads/1/3/1/8/131856827/eef66.pdf
    • https://vomimefime.weebly.com/uploads/1/3/5/3/135316042/5331993.pdf
    • https://menuzuxa.weebly.com/uploads/1/3/1/0/131070619/acf1ffd0.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/0b953eb4-1c8e-4617-bcd1-75cff7fb5a41/22876493996.pdf
    • https://uploads.strikinglycdn.com/files/4c1205d1-4a84-4ce2-a4d1-2b0c048a7bf5/88126195602.pdf
    • https://uploads.strikinglycdn.com/files/00f536e5-7d9d-4de3-bf70-f73574df461d/wareputetatamubexul.pdf
    • http://depowota.pbworks.com/w/file/fetch/144852927/diesel_generator_training.pdf
    • https://uploads.strikinglycdn.com/files/995e34a3-6bee-43fe-9a8d-5b1b27fb0432/71366854489.pdf
    • http://rixojananin.pbworks.com/w/file/fetch/144866703/70636573979.pdf
    • https://uploads.strikinglycdn.com/files/9955b267-e86c-4b71-a0d6-750ff9b72b8e/nonupokafe.pdf
    • http://fepewuwakow.pbworks.com/f/sekomavutifusadiruvitozo.pdf
    • http://fafukite.pbworks.com/f/free_real_tiktok_followers_no_human_verification.pdf
    • https://uploads.strikinglycdn.com/files/c0ee06b1-b346-45fd-89a4-a116ac72d63f/42507109899.pdf
    • http://punumiboxo.pbworks.com/w/file/fetch/144813858/70256315355.pdf
    • https://uploads.strikinglycdn.com/files/adf33541-fd8d-40d8-9dc3-a1f9cf2661b9/95384061605.pdf
    • http://tukufidanega.pbworks.com/w/file/fetch/144627909/top_trending_hashtags_on_instagram_right_now.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea81.bin
c93caf67ae4e745e55fd58830cf6fda79da2541b074d667439bd86573a8645e8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA81 5496 bytes
font_01_sfnt_off0000fd2b.bin
17893b75b1e4caa39b456dc0cf8a163c7223a5272fd05c07ebd4f0f7088e23c1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFD2B 10952 bytes
font_02_sfnt_off000122f7.bin
532315dfdc59b350d447ad91845dd8cc72a836e684f536ab9a4305dc5b53fb8e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x122F7 16204 bytes

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