Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ddb4ffa34f13d19…

MALICIOUS

PDF

69.3 KB Created: 2021-03-09 22:02:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a47846e18f58ef973ee022cc1caff039 SHA-1: a6f3fe91c6e9747687b96d1429241854e9659362 SHA-256: 7ddb4ffa34f13d19d68e2a69daf51c43cf96c001d49fa9f5823df5dbe27e2090
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, which is a common tactic for SEO manipulation or distributing malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to potentially harmful sites.

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://druttle.ru/123?utm_term=vidmate++2019+apkpure
    • http://zinuvudoliku.iblogger.org/cirrose_hepatica_em_caes.pdf
    • https://cdn.sqhk.co/gulanuwe/echjiHP/35447912191.pdf
    • https://cdn.sqhk.co/buxifuludo/jiehasE/52844752573.pdf
    • http://domuxiwedazov.22web.org/30159335803.pdf
    • https://zerakilun.weebly.com/uploads/1/3/2/6/132695460/wusodizagobudodedep.pdf
    • https://cdn.sqhk.co/rurokusulos/3helDFv/talos_brawl_masters_apk.pdf
    • https://didilajuti.weebly.com/uploads/1/3/4/5/134585724/putimigapelopipipunu.pdf
    • https://cdn.sqhk.co/kitatoze/hdhjibs/wigebekuf.pdf
    • https://nudopimiga.weebly.com/uploads/1/3/1/0/131070212/pabapifujisan.pdf
    • https://cdn.sqhk.co/wipedekis/HYghjjL/shareit_app_download_jio_phone.pdf
    • https://dadurafiwazozu.weebly.com/uploads/1/3/4/7/134768329/rojozoluvufeziwozika.pdf
    • https://faxezufag.weebly.com/uploads/1/3/0/8/130874059/semorupaxulogixe.pdf
    • https://cdn.sqhk.co/wizokawoxo/SCGjege/crystal_jobli_and_blaster.pdf
    • https://cdn.sqhk.co/tivinarafuvu/1giQjbZ/new_english_songs_2019_youtube.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/bidivo/edit_text_files_online_free.pdf
    • https://s3.amazonaws.com/tetofamuxulil/free_games_bejeweled_blitz_full_version.pdf
    • https://s3.amazonaws.com/luborinizu/zetagimoj.pdf
    • http://rilerulijomowam.rf.gd/how_to_apply_for_snap_benefits_in_pennsylvania.pdf
    • https://724418e0-3ace-43c1-abd8-628b4820fc71.filesusr.com/ugd/6df952_0be18789021946ebabc0908a820b5a89.pdf?index=true
    • https://s3.amazonaws.com/jexijer/84585456250.pdf
    • https://527ed197-5826-4432-9c89-449afa9d705e.filesusr.com/ugd/65ef70_9fa33718579d46cca3fd51c4bc6e547f.pdf?index=true
    • http://sipariwemarisu.rf.gd/gefeturufopidofevavoduf.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_off0000d2dd.bin
7835d6b706416691f2702a05a41806e67e19029331b82ecf137c5a8403b377c5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD2DD 5408 bytes
font_01_sfnt_off0000e534.bin
c0b2ea13373167dcd592b1ef577ffbdbd6088452d8c9544763abd1db7b53491f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE534 10204 bytes

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