Malicious PDF — malware analysis report

Static analysis result for SHA-256 db21a275f9fcf09c…

MALICIOUS

PDF

88.6 KB Created: 2021-03-22 10:49:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: bc367e006d0b6261e2fedb1a28d04cfc SHA-1: bdea578e14d232400ed6c5b8c08e9bb2c1a2afdd SHA-256: db21a275f9fcf09cbe3fc3464df208add2d33838ed7160c295c8010901f40eab
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains numerous external links, many pointing to Weebly and other domains, suggesting a link farm or phishing lure. The 'SE_CLICKFIX' heuristic indicates the document likely instructs users to execute commands, a common social engineering tactic. ClamAV detection and ML classification confirm its malicious nature, likely as a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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.
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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://xezojetit.ru/award?keyword=advanced+algorithm+tutorial+pdf PDF link annotation
    • https://sizomejuxitiz.weebly.com/uploads/1/3/4/7/134748976/sirobi-mefezotevezuro.pdfIn PDF document text
    • https://jelifamije.weebly.com/uploads/1/3/4/3/134320618/1180159.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488569/normal_60348aa99b062.pdfIn PDF document text
    • https://jikodidujur.weebly.com/uploads/1/3/5/3/135319234/xowepujomo_bexisaxufag.pdfIn PDF document text
    • https://taxufutusa.weebly.com/uploads/1/3/4/5/134514166/mokage.pdfIn PDF document text
    • https://kimukotepasa.weebly.com/uploads/1/3/5/3/135329918/214198.pdfIn PDF document text
    • http://hackins.site/25309399159mc817.pdfIn PDF document text
    • http://badge-verification-center.com/how_often_to_replace_samsung_refrigerator_water_filterc8ej4.pdfIn PDF document text
    • https://jamofavoxaf.weebly.com/uploads/1/3/4/6/134698870/zapewexokewinuxe.pdfIn PDF document text
    • http://liketime.online/rixesumuligokex7ufb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370088/normal_600eca8562fc9.pdfIn PDF document text
    • https://sojabejob.weebly.com/uploads/1/3/4/8/134890412/kuvavepubu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/ziwuvijevo/kewipujojiguketazu.pdfIn PDF document text
    • https://s3.amazonaws.com/xebuvuwov/26710705792.pdfIn PDF document text
    • https://s3.amazonaws.com/fajonubinomeder/chale_aana_flute_instrumental_ringtone.pdfIn PDF document text
    • https://s3.amazonaws.com/kulinisokakewi/spatial_analysis_in_r.pdfIn PDF document text
    • https://s3.amazonaws.com/divelatoxa/monster_hunter_generations_insect_glaive_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/gupojakami/bimikuxanijasivija.pdfIn PDF document text
    • https://s3.amazonaws.com/bipepezuwed/tft_cheat_sheet_reddit.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e562.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE562 6744 bytes
SHA-256: 0eac1552a6a0cc8d6d43e14f5c157d052ff2bf21460314f67a2c213e0a454e63
font_01_sfnt_off0000f649.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF649 5324 bytes
SHA-256: 4a730db3144f31c724a3f785554538617e4e52c930c833e5a4e282732a079ec8
font_02_sfnt_off0001083e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1083E 11072 bytes
SHA-256: a34c633666b685b04301b9fd1a1f5d527f9a5ba78a8f47394d90a6f7c98829ff
font_03_sfnt_off00012e3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E3D 16512 bytes
SHA-256: ac30c5a481f8d11735dc305d7294ddc418efdde0755eab320054d9d68758bf0f
font_04_sfnt_off000144b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144B5 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378