Malicious PDF — malware analysis report

Static analysis result for SHA-256 7819cb99068952eb…

MALICIOUS

PDF

76.6 KB Created: 2021-03-15 03:08:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: bb222e40a44cfec5c3493ddba59f1e6c SHA-1: 25438f03eaf6b7c1c6cf88239149f5bcfdb22d78 SHA-256: 7819cb99068952ebe269d861f78c2ce7feca03bb5489859e63a9278df7ab4b54
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and a machine learning classifier, with ClamAV detecting it as a phishing trojan. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The document body is heavily obfuscated and appears to contain junk data, but the presence of external URIs and the PDF_SEO_LINK_FARM heuristic strongly indicate a malicious intent to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://gimoguvi.ru/strik?utm_term=who+made+up+the+second+estate PDF link annotation
    • https://cdn.sqhk.co/wukopojenava/QlcDgcu/boost_my_appetite.pdfIn PDF document text
    • https://falojaba.weebly.com/uploads/1/3/0/7/130776150/84cbc.pdfIn PDF document text
    • https://moraraxewurazi.weebly.com/uploads/1/3/4/0/134042425/6b0b1c2c373b6.pdfIn PDF document text
    • https://cdn.sqhk.co/tusenepobam/jbjahis/52427355602.pdfIn PDF document text
    • http://luxasireku.sportsontheweb.net/vokorigo.pdfIn PDF document text
    • https://cdn.sqhk.co/nemazuwigumo/fDhigcz/54663295253.pdfIn PDF document text
    • http://zedateve.mypressonline.com/single_variable_calculus_early_transcendentals_solutions_manual.pdfIn PDF document text
    • https://cdn.sqhk.co/namulofilox/0jbhTIa/woodturning_3d_lathe_simulator_wood_woodturning.pdfIn PDF document text
    • https://cdn.sqhk.co/vumulevezuf/hfh7Jgd/47517868947.pdfIn PDF document text
    • https://cdn.sqhk.co/vasozaponem/dzNjgcK/summoners_war_mid_game_guide_2018.pdfIn PDF document text
    • https://gezepisazijite.weebly.com/uploads/1/3/4/7/134769425/wabimal_defapifeta_winelidi.pdfIn PDF document text
    • https://cdn.sqhk.co/baxijaxazixi/gdA22ha/37974503569.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://170d08c7-2527-4f8e-8bc4-cf7f6ffab704.filesusr.com/ugd/afe24e_8a8dbfab6626475aad98c26e96a1ca6a.pdf?index=trueIn PDF document text
    • http://mubodadekutaxim.atwebpages.com/93393185043.pdfIn PDF document text
    • https://9cfe8934-cc69-4f76-a0d0-2e9849ea4530.filesusr.com/ugd/fd9558_1fa95b2775f54809a4ca4f0dff82495f.pdf?index=trueIn PDF document text
    • https://0feddc0e-03bc-46a3-a741-45303deff239.filesusr.com/ugd/6ea6a2_c8aadec8d97c4c25a6af6d230f41cb7f.pdf?index=trueIn PDF document text
    • https://d45380bd-a93d-4ef2-b2bd-4c7806d1f6db.filesusr.com/ugd/5d2cf3_4c46e022b4e24b0c8236d54a8aff2bed.pdf?index=trueIn PDF document text
    • http://nedizilunok.myartsonline.com/47598551036.pdfIn PDF document text
    • https://02796127-04ec-4c85-b270-c6f7310ebb18.filesusr.com/ugd/ce0e6d_3e3a9973128f4187b66cd67d2a8b56d7.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000efd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFD3 5196 bytes
SHA-256: 5465d3865764d62169a82c77ff2997786c4bdc42e689e2112c13e3f41fcb3e61
font_01_sfnt_off00010164.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10164 10576 bytes
SHA-256: 41201a40d5736c02dc3d7535079d2214412948c7793fd89dbdfd4ff7d23f2fc1