Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b38fb4e833badec…

MALICIOUS

PDF

81.3 KB Created: 2021-03-14 03:53:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: bee11c3afd0f399bc9be28148e5109e8 SHA-1: 38e41eb360c0d44baee3ec25170b05df27115bc1 SHA-256: 1b38fb4e833badec5a6caf5da4242aebb8732aea51720610b4574ec08d333010
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 0.9997

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://zajinet.ru/strik?utm_term=introduccion+a+las+finanzas+personales+pdf PDF link annotation
    • https://cdn.sqhk.co/mubasetopagu/xBjfyiA/wakekesafuli.pdfIn PDF document text
    • http://itwomen.space/vufegekusejozolayts43.pdfIn PDF document text
    • http://am-sound.ru/4907517865736mzb.pdfIn PDF document text
    • https://cdn.sqhk.co/rufosopufu/gqgdjcw/numedo.pdfIn PDF document text
    • https://wojosonasejedop.weebly.com/uploads/1/3/4/6/134613238/fonumuleraniw_lawadezewi_mudijitezimid_farededemuj.pdfIn PDF document text
    • https://refitefajo.weebly.com/uploads/1/3/2/6/132683069/fawar_serawekasuku.pdfIn PDF document text
    • https://dejurepezuneron.weebly.com/uploads/1/3/1/4/131452785/65627d.pdfIn PDF document text
    • https://vokijovagugudis.weebly.com/uploads/1/3/0/7/130776016/469670.pdfIn PDF document text
    • https://cdn.sqhk.co/jawutuwek/hihchds/fobiwas.pdfIn PDF document text
    • http://habercigo.com/how_to_install_printer_hp_deskjet_2545z7zun.pdfIn PDF document text
    • https://kezagoguz.weebly.com/uploads/1/3/4/1/134131769/javomelefesil_bixofiwipo.pdfIn PDF document text
    • https://mimifutugeteze.weebly.com/uploads/1/3/0/8/130874087/nezijefawi-nuvuxune.pdfIn PDF document text
    • http://kukushpa.fun/faxunipiwoe46.pdfIn PDF document text
    • https://cdn.sqhk.co/tuzukada/bA3qhbP/87909003860.pdfIn PDF document text
    • http://copyrightprivacy.site/xotojuliwoxuzojanicgmdo.pdfIn PDF document text
    • http://cashtanks.fun/system_engineering_definition923q5.pdfIn PDF document text
    • http://fontawesome.iohttp://fontawesome.io/license/In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://e0220c8c-c322-4c33-af83-7c5b0fe00b66.filesusr.com/ugd/a771bd_a851d1ffc495427ca9ceb0093c4525c8.pdf?index=trueIn PDF document text
    • https://f37c3615-20b0-4e70-b1e7-2acf34113780.filesusr.com/ugd/1e533a_602714029f754d9d90b0e399cae4f01a.pdf?index=trueIn PDF document text
    • https://28f2c00a-638b-45ec-8848-4d649cb6aba9.filesusr.com/ugd/946f28_0c5131a88c434edcb54e369d49a723d1.pdf?index=trueIn PDF document text
    • https://5b3500e9-40b4-440a-9ada-171ed8bcf4c9.filesusr.com/ugd/7820d0_2ffab5febe00439fb40f91fc61b0729d.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f631.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF631 1696 bytes
SHA-256: 2e3af33663d03ec9a00a2230504bb9e8f98e67bd55fe1d0bcc4ef3f4c4b957b0
font_01_sfnt_off0000fe5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE5C 5136 bytes
SHA-256: 7f2b1abea0488ee36442ea3f4e4924a3acb291ab3d575702b5e100bccb097df3
font_02_sfnt_off00010fea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FEA 12212 bytes
SHA-256: a124a3c53c3f7d8e0542ba5e8974bb27f5195eeb2c143e9a94d11fc7eac82481

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