Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a6487a6e33f489a…

MALICIOUS

PDF

84.9 KB Created: 2021-04-02 13:07:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: d3713cf1a5bf3d6ca4c107dda8bc9cef SHA-1: c4f13f8f3fd44a22f1034d5717f9d82fdc7f146a SHA-256: 3a6487a6e33f489a50d1351701728516d38e9fd33e5f416e41f0cfb4534181c9
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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
  • 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.
  • 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 https://resalured.ru/123?utm_term=annabelle+2+movie+in+tamil PDF link annotation
    • http://fajamad.mypressonline.com/tijosepepaloz.pdfIn PDF document text
    • https://cdn.sqhk.co/kamepixuxuk/icNAZij/rexopuvepukafin.pdfIn PDF document text
    • http://wotidoteked.mywebcommunity.org/how_to_connect_ipega_to_iphone_7.pdfIn PDF document text
    • https://cdn.sqhk.co/saligoliti/e5rsghq/mufoxowewixeg.pdfIn PDF document text
    • https://cdn.sqhk.co/ratobomebal/cP3hgfV/tesobizegasekuwanisalesi.pdfIn PDF document text
    • https://cdn.sqhk.co/devepogisog/DRigLgf/datipepezulefofonoguna.pdfIn PDF document text
    • https://cdn.sqhk.co/lasesekov/6jgidz2/xutudilarizelazal.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://84d5b3ab-51dd-4312-87b7-51df18fb3b26.filesusr.com/ugd/9ea9b6_1f64393942bf4c81b9398967757253b8.pdf?index=trueIn PDF document text
    • https://4eb83289-b313-4542-b68c-79a1d4783db4.filesusr.com/ugd/f6336d_9e45b982348945fbbe02d31cff2432d7.pdf?index=trueIn PDF document text
    • https://d525ee04-2a40-494f-8ba9-fee52f7b18ee.filesusr.com/ugd/8b8e24_ffb320f9891b43b681cefa484ab8575d.pdf?index=trueIn PDF document text
    • https://7aff118d-26f6-4d76-9bc9-1838009e7274.filesusr.com/ugd/f80014_936a5db7e5e84e2093a72a608ce0a4c7.pdf?index=trueIn PDF document text
    • https://70848fb0-0fd0-490a-9360-2ffa38fc212c.filesusr.com/ugd/08e331_be40aeb319124d65bdc40f8514d1559a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/futamo/kigogowopus.pdfIn PDF document text
    • https://s3.amazonaws.com/bufexa/liwakelabojozi.pdfIn PDF document text
    • https://a7ed8af5-5e4a-4eaf-98d7-51655494ca15.filesusr.com/ugd/b5c45a_99181ae125ef4c76b6e1875a5be3faae.pdf?index=trueIn PDF document text
    • https://73e25548-3913-4bbb-aa69-a1b25f69568d.filesusr.com/ugd/cece23_2ce0831fc6ac4fbbadb09d8ed0cc2f2f.pdf?index=trueIn PDF document text
    • http://nazowovemozugiv.myartsonline.com/can_you_cook_a_butterball_turkey_in_an_oven_bag.pdfIn PDF document text
    • https://f84ffea9-2755-49c2-9cb5-47ca8b55fe65.filesusr.com/ugd/0adedf_49fc04eae35246ca844996d375d7bd94.pdf?index=trueIn PDF document text
    • https://24a70dd4-b549-4b9e-9c0a-6eea45ab85ad.filesusr.com/ugd/ab0c63_c77dc2fa1a1349a5b1c34d6711a9f1e7.pdf?index=trueIn PDF document text
    • https://9d1e48ad-bcd7-4831-9b7b-7108443a63b6.filesusr.com/ugd/136d07_7a498e1e49d14bed8e5c4337f83e799c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gupojakami/74642682578.pdfIn PDF document text
    • https://s3.amazonaws.com/pesetufavo/codycross_answers_group_279_puzzle_5.pdfIn PDF document text
    • https://3df016ad-b40f-424f-9918-b96c60f46212.filesusr.com/ugd/387bfe_5b49c1e468e740bfa3ff22f81ae3a57a.pdf?index=trueIn PDF document text
    • https://de315c38-daa2-4293-b666-e554ba9b7d65.filesusr.com/ugd/564d2e_faa6c616faba41ccad153500f1f7d0ba.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA75 4880 bytes
SHA-256: cfb7b582b940673f943839d4993c2ce634e0bf396a6dfd4267c9e4f19bab9053
font_01_sfnt_off0000fafd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAFD 3028 bytes
SHA-256: 479254aa92cc1bdb73d6b172180aba9e9309b4c694322cd508e68a0367e8470d
font_02_sfnt_off00010783.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10783 11184 bytes
SHA-256: 54ba42238d522319c2cf868ad1631381826ee02a7a8bff5ac2cdb892f50f96d4
font_03_sfnt_off00012e0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E0B 16896 bytes
SHA-256: 0c2799152ec5f3733a62b8d9e914cfeca1a263bbb9929e1a6825a490820257f3