Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f3bba969494747a…

MALICIOUS

PDF

75.2 KB Created: 2021-04-16 18:21:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: f6d608f6ceda9fcd11a7b2e5f7ba283e SHA-1: d994cf049ab77fa4f7cdd30f5579e9dc1af1359f SHA-256: 1f3bba969494747ab031fd8f1d2efdd4a191270493dc396fc452543ae010d995
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9993

Heuristics 5

  • 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 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://dafemum.ru/strik?utm_term=how+to+write+a+paragraph+about+your+favorite+animal PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4501632/normal_5fdfd4d973e72.pdfIn PDF document text
    • https://ruworelolovifuf.weebly.com/uploads/1/3/4/4/134462917/nanavot-mojaruro-lonozujunisop.pdfIn PDF document text
    • https://gonotelavekufuf.weebly.com/uploads/1/3/4/6/134615299/365463cf47d69f.pdfIn PDF document text
    • http://sesizuxewewax.mygamesonline.org/7886540440.pdfIn PDF document text
    • https://sepubipig.weebly.com/uploads/1/3/4/4/134445985/wuwabupi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418972/normal_5ffcd72bc8ac0.pdfIn PDF document text
    • https://palukenibimel.weebly.com/uploads/1/3/4/4/134401756/8430330.pdfIn PDF document text
    • http://zelafagilu.iblogger.org/wajuraziwusajuxifefe.pdfIn PDF document text
    • http://zazodasowe.22web.org/burger_king_gutscheine_2020_april.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cc652f91-b1ab-470c-b36f-46d838ef85b2.filesusr.com/ugd/fbccce_aa3c8af509254d87a0972ac9cc2ccd2f.pdf?index=trueIn PDF document text
    • https://254a6a59-343e-4b7e-907c-c4819e171fff.filesusr.com/ugd/decf6f_dec48aaf55b04499ba0fec49f3411c88.pdf?index=trueIn PDF document text
    • http://lorojol.rf.gd/bluebeam_free_trial.pdfIn PDF document text
    • https://s3.amazonaws.com/xijalovelokolep/rca_tablet_reset_google_account.pdfIn PDF document text
    • https://9f5bcc56-a059-4f00-ae85-604acd6a3d2d.filesusr.com/ugd/ac9354_05f707cf73a54639bb6c1cb897b1d9cf.pdf?index=trueIn PDF document text
    • http://dojafeduzig.myartsonline.com/bilbao_tourist_map.pdfIn PDF document text
    • https://ba85394b-11ac-4ca4-926b-74ca936c52e1.filesusr.com/ugd/5ccfc8_700d80918cd84aed806ad1eefbbf906b.pdf?index=trueIn PDF document text
    • http://davofunup.onlinewebshop.net/65227853928.pdfIn PDF document text
    • https://s3.amazonaws.com/salade/20724275493.pdfIn PDF document text
    • https://s3.amazonaws.com/jevopemosod/tolegilipubesagozoluwumop.pdfIn PDF document text
    • https://s3.amazonaws.com/xijuxosisomuna/54196709827.pdfIn PDF document text
    • https://s3.amazonaws.com/fivebo/girl_scout_cadette_guide_book.pdfIn PDF document text
    • http://benugafudom.epizy.com/how_to_reset_heater_in_ford_edge.pdfIn PDF document text
    • https://95c758d6-fd33-43c6-b5d0-f1f55e07e946.filesusr.com/ugd/cb0188_ac6ae954edac4c879bd625cf9b26d83e.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_off0000e7e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7E5 5492 bytes
SHA-256: 136b6f84adc97db3940c25aca1ee152bb4e3da4c4395c77f6c092c6d530c250d
font_01_sfnt_off0000fa8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA8C 10728 bytes
SHA-256: dc6579f64a2e158d6eaf08fd074230113c5ee3c446c81b139861d3b30731b3bd