Malicious PDF — malware analysis report

Static analysis result for SHA-256 960c448348febbc1…

MALICIOUS

PDF

91.4 KB Created: 2021-03-22 09:51:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 157f997a083ac23df90fb82e42de7e5e SHA-1: 536984a83bfd408faf4171c23b9bcb2f20e43cf3 SHA-256: 960c448348febbc17dc574ee71cdcccd29784eaff5ada4aab5618b0bbbe20ebc
156 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 Weebly and other free hosting services, indicative of a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, specifically a phishing or trojan distribution campaign. While no scripts were directly extracted, the PDF structure and embedded URLs are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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 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.
  • 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://baarspo.ru/wix?keyword=add+subtract+multiply+divide+polynomials+worksheet+pdf PDF link annotation
    • https://gasaromub.weebly.com/uploads/1/3/0/7/130776100/4f366d0de.pdfIn PDF document text
    • https://wawokosekipazas.weebly.com/uploads/1/3/1/4/131452886/waxudubata.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454161/normal_600350a87bdb5.pdfIn PDF document text
    • http://save50it.info/craftsman_radial_arm_saw_motor_bearingswvymu.pdfIn PDF document text
    • https://garovinarabibaf.weebly.com/uploads/1/3/5/2/135293384/butedipar.pdfIn PDF document text
    • http://lnstagramlivesupportcenter.com/jizikuremebudekiw4kw6.pdfIn PDF document text
    • http://hydraruzxpnew4af.exchange/77804874376jgptm.pdfIn PDF document text
    • http://mybiol.site/celebrate_recovery_step_study_lesson_4ppzyz.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450260/normal_5ff6a930c8310.pdfIn PDF document text
    • http://helplnstagramcontact6088758.com/loxegakoxojujibuvovasigr04ht.pdfIn PDF document text
    • http://kernig.store/how_to_smudge_on_paint.netw50cb.pdfIn PDF document text
    • https://voxipomawo.weebly.com/uploads/1/3/1/3/131379395/funomafonew-fujine.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416151/normal_5fd651ea34260.pdfIn PDF document text
    • http://natur-green.fun/nintendo_3ds_emulator_apkpure0i31h.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/nuxulikiwab/dabetejuragopiwovo.pdfIn PDF document text
    • https://s3.amazonaws.com/wibedubosateg/full_body_strength_training_for_runners.pdfIn PDF document text
    • https://s3.amazonaws.com/kotodur/which_canon_lens_is_best_for_portrait_photography.pdfIn PDF document text
    • https://s3.amazonaws.com/tugafebip/assamese_poem_whatsapp_status_video.pdfIn PDF document text
    • https://s3.amazonaws.com/palikuvexake/83643139980.pdfIn PDF document text
    • https://s3.amazonaws.com/puretulenuza/42664706852.pdfIn PDF document text
    • https://s3.amazonaws.com/diwitapezu/assamese_video_song_mission_china.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fd83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD83 6440 bytes
SHA-256: 705377623a4c4344e02470fedf876d1ed6f0c7c0eac322cafb15afc9430d14bf
font_01_sfnt_off00010d77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D77 5840 bytes
SHA-256: 5662b30274f8611cd01f8ccf1f12471f060ddfedb03e4e72623ce2e1fd7eea56
font_02_sfnt_off0001214a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1214A 11212 bytes
SHA-256: 3d0affd218ab67014902a5ad0f773a3f16da34d7374cf504c8c9a5a8d9f5df75
font_03_sfnt_off000147b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x147B7 16760 bytes
SHA-256: db6000945e2dfe7b6f2be26da9932e4250e7730b6740d1ee882704b8d5483ad8

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