Malicious PDF — malware analysis report

Static analysis result for SHA-256 83c31ecb24ca9473…

MALICIOUS

PDF

81.4 KB Created: 2021-10-13 06:02:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d4b1673e62c6be0daa109cb22bc75638 SHA-1: 09e8499ed8437365961da1bab890590c6f3aaf5a SHA-256: 83c31ecb24ca947367d9542200ccc6bb4aa8a8ee93802038dd7b106557891aad
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, with a high-confidence heuristic identifying one as an algorithmically-generated URL likely intended for malicious purposes. The ClamAV detection and ML classifier further support its malicious nature. While no scripts were directly extracted, the structure suggests it's designed to lure users to download further malicious content, aligning with spearphishing attachment tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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 http://happyland-nsk.net/ckfinder/userfiles/files/korodaponawur.pdf
    • https://terracetemayonetim.com/upload/ckfinder/files/dilodarizuxani.pdf
    • http://www.jindatunnel.com/up_files/file/71744358539.pdf
    • http://lehnerkom.de/images/uploaded/file/mikug.pdf
    • http://kaitosushisb.com/uploads/files/gopewasa.pdf
    • https://3rproject.eu/ckfinder/userfiles/files/vumotamanuwiwufedus.pdf
    • http://ilkjv.com/Images/Media/files/69180474697.pdf
    • https://evermoral.hk/upload/file/1632157038.pdf
    • https://tahsindincer.com/upload/ckfinder/files/juganikegivumafidogum.pdf
    • http://proclima-membranes.ru/userfiles/file/mijosu.pdf
    • http://theprofitnesstrainers.com/userfiles/file/92065102651.pdf
    • https://baptistfriends.org/media/38357761444.pdf
    • http://mobilesamara.com/img/files/file/waresudaxa.pdf
    • http://camel-republic.com/media/userfiles/files/96729089781.pdf
    • http://villa-carlshorst.de/sites/default/files/file/zadepi.pdf
    • http://inhome360.ru/admin/ckfinder/userfiles/files/zarumigiremagalix.pdf
    • http://goldendoodlesofthesierranevadas.com/userfiles/file/xozilojuwevimedemedek.pdf
    • https://fpcofmacon.com/nbloom/fckuploads/file/59192659348.pdf
    • http://carsonpokebar.com/uploads/files/28117170374.pdf
    • http://crocepadrekolbe.it/userfiles/files/danalibixijiro.pdf
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/73fdb5c7eca8ae3ae9b02b723f7248d9/60555816677.pdf
    • https://datajournonepal.org/files/23691297182.pdf
    • http://feedproxy.google.com/~r/Xvkpad/~3/cmwvf4RlXg4/uplcv?utm_term=how+many+sentences+is+too+much+for+a+paragraph
    • 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://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_off0000d507.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD507 16792 bytes
font_01_sfnt_off0000ed1e.bin
5f108e30935fc0bf027c20971392ad837c29c3596486b096a7022ea4cd78c015		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED1E 11172 bytes
font_02_sfnt_off0001071b.bin
fbb6f4a6247ec2a4ec6a7917f06dfe896af2039812bafc05842cb19cc90786eb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1071B 18584 bytes

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