Malicious PDF — malware analysis report

Static analysis result for SHA-256 83c2bd3db9b3e21c…

MALICIOUS

PDF

88.5 KB Created: 2021-03-18 20:13:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 11aa673584edde2f8d7b02088e1f88cd SHA-1: 72cdc0d899503d3586b2af6db4b1aab2bdc235c1 SHA-256: 83c2bd3db9b3e21c8906c14880be76a62fb0fe2b1ae39a8620db69a4b5603d54
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a large number of external links, many of which are likely part of a link farm designed to obscure the true malicious destination. The primary malicious URL identified is 'https://ponafet.ru/award?keyword=download+bacaan+yasin+dan+tahlil+pdf', which is likely used to distribute a secondary payload or redirect to a phishing site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ponafet.ru/award?keyword=download+bacaan+yasin+dan+tahlil+pdf
    • https://static.s123-cdn-static.com/uploads/4451348/normal_5fe29438bb75f.pdf
    • https://zalivibutadugaf.weebly.com/uploads/1/3/5/3/135391941/puruk.pdf
    • https://static.s123-cdn-static.com/uploads/4366312/normal_6005f54b2a14a.pdf
    • https://pusobufuronuwu.weebly.com/uploads/1/3/4/4/134475569/wopez.pdf
    • https://fozogefijegajor.weebly.com/uploads/1/3/1/4/131453134/gozeneketosipo-bivozadaxot-wujutesuda.pdf
    • https://metiledozixav.weebly.com/uploads/1/3/1/1/131164016/zawalirulokiwe.pdf
    • https://mujabimebedegi.weebly.com/uploads/1/3/4/2/134234846/fukukijodivij-vazed.pdf
    • https://cdn-cms.f-static.net/uploads/4387412/normal_5fd0dde9a9a4d.pdf
    • https://cdn-cms.f-static.net/uploads/4481522/normal_600ea04b37ff1.pdf
    • https://cdn-cms.f-static.net/uploads/4428054/normal_600c493202d24.pdf
    • https://cdn-cms.f-static.net/uploads/4485822/normal_6016150092f6b.pdf
    • https://fuzanageguv.weebly.com/uploads/1/3/5/3/135305388/tuzifiwajorobuj_wegim_kasuf_xanon.pdf
    • https://static.s123-cdn-static.com/uploads/4451208/normal_5ffe17cd5fd55.pdf
    • https://static.s123-cdn-static.com/uploads/4475389/normal_5fc68389c2a34.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/viregujipowuru/how_many_angels_could_dance_on_the_head_of_a_pin_religion.pdf
    • http://xajejosiwoja.epizy.com/71543521954.pdf
    • https://s3.amazonaws.com/resisuna/alimentacion_saludable_vegetariana.pdf
    • http://gusutawidike.epizy.com/character_worksheet_2.pdf
    • https://s3.amazonaws.com/semuxemakaw/tubasupigazadifupeba.pdf
    • https://s3.amazonaws.com/toguvaju/rinnai_solar_hot_water_systems_prices.pdf
    • http://sonapap.rf.gd/hamilton_beach_garment_steamer_review.pdf
    • https://s3.amazonaws.com/bajuse/jitejobugubepo.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001196d.bin
277dee4a025c48ceb515e8cc0d0cb09c6ebe3b737117d337d7ee5c5e3f9cb104		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1196D 5480 bytes
font_01_sfnt_off00012c29.bin
2cb5fd2ccff6ee1a20531f720520e6733d228c363415c11b07d4c778290886a3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12C29 12600 bytes

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