Malicious PDF — malware analysis report

Static analysis result for SHA-256 07e9a522d7f7edea…

MALICIOUS

PDF

90.4 KB Created: 2021-03-25 10:39:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 141ec6f3ad1a2cea033e9860d1c9074f SHA-1: ddba1fb09f194a2be19d5cc3100f45834ea66eae SHA-256: 07e9a522d7f7edea5a44e9385c1c9191726a02235223e3756dc9d27b64fb7021
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable hosting, indicating a link farm or SEO manipulation tactic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and heuristics point towards it being used to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://pelibifir.ru/123?utm_term=ajio+app++free PDF link annotation
    • https://fesomexipilajuj.weebly.com/uploads/1/3/3/9/133997099/5996740.pdfIn PDF document text
    • http://austritkfa.com/91329102050b044.pdfIn PDF document text
    • https://belonimilulufaf.weebly.com/uploads/1/3/4/4/134403367/musalibaluzilixunij.pdfIn PDF document text
    • https://dopitusorotid.weebly.com/uploads/1/3/0/7/130738794/981738.pdfIn PDF document text
    • https://tumumasozoborux.weebly.com/uploads/1/3/1/4/131453535/lovoroxosu.pdfIn PDF document text
    • https://kejijasorakabil.weebly.com/uploads/1/3/4/3/134311956/3511543.pdfIn PDF document text
    • http://geesecam.com/bookmark_template_free0myn7.pdfIn PDF document text
    • https://mupoveno.weebly.com/uploads/1/3/4/3/134371030/8c857.pdfIn PDF document text
    • https://defuzeje.weebly.com/uploads/1/3/4/8/134883556/kidajevega.pdfIn PDF document text
    • http://helpcopyright-service.com/fargo_hdp5000_driver_update3rvlk.pdfIn PDF document text
    • https://simefaburiso.weebly.com/uploads/1/3/0/8/130814859/97b3c36.pdfIn PDF document text
    • https://waramexebogod.weebly.com/uploads/1/3/1/8/131856917/mozugepatu.pdfIn PDF document text
    • http://rabisoluvilava.iblogger.org/columbia_shuttle_disaster_report.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/nedijowewoded/dibrugarh_university_distance_education_result_marksheet.pdfIn PDF document text
    • http://jijabivu.epizy.com/acca_f5_exam_kit_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1f95a3bd-fe1b-4f74-bc19-fa5c185659b1/wakixibife.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0742f834-8f37-422e-9a4d-be9663523afc/zixamipezanokexeradova.pdfIn PDF document text
    • https://s3.amazonaws.com/wapabefizosumi/2007_toyota_avalon_xls_owners_manual.pdfIn PDF document text
    • http://texovej.epizy.com/gujuvulizimesonugigexid.pdfIn PDF document text
    • https://s3.amazonaws.com/jusagi/how_to_solve_normal_probability_distribution.pdfIn PDF document text
    • http://wumijitune.epizy.com/91139287574.pdfIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010349.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10349 4748 bytes
SHA-256: 4e0a60219fb77d327145cb5b79b22b6495b2318d713ba12643025407f3501df1
font_01_sfnt_off00011389.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11389 22468 bytes
SHA-256: f3005126dee6fde98411d0df0d7265ef825532ec05e89a6d2b28c76fbdc7edb9
font_02_sfnt_off00014751.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14751 16164 bytes
SHA-256: c41fc46809d2260d2d1a821cef6bb00dae560fdbad380da94a93f29d012df54e