Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c8ccdd7445ea224…

MALICIOUS

PDF

86.5 KB Created: 2021-03-16 09:33:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1d27b8c77531f43144a468776c97c005 SHA-1: ed98ebdf41fe0954b9c704e4ad9227cb95d9895e SHA-256: 8c8ccdd7445ea224aa665f0f16eb286c589da33afb1d2d72be49610d26fa45df
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a common tactic for SEO spam or phishing lures, as indicated by the PDF_SEO_LINK_FARM heuristic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were directly extracted, the PDF structure and external links point towards an attempt to redirect users to malicious sites.

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://resalured.ru/award?keyword=advanced+vocabulary+worksheets+pdf
    • https://cdn.sqhk.co/zugivakizo/hjicijf/migajiziwololujovufifim.pdf
    • https://noxagejes.weebly.com/uploads/1/3/0/7/130739287/6fdf19f55b2aa1.pdf
    • http://nukowivoxom.iblogger.org/diamond_math_problems_worksheet_answer_key_2016.pdf
    • https://cdn.sqhk.co/wizokawoxo/bfxnqMd/tedizoropasapodobuxave.pdf
    • https://cdn.sqhk.co/bajipugotox/28hcPUd/18775458651.pdf
    • https://vamububok.weebly.com/uploads/1/3/5/3/135317225/1414128.pdf
    • http://tonalemeketav.66ghz.com/radedaruluwodepobakomu.pdf
    • https://cdn.sqhk.co/posogamumut/uijK4ji/pemipebiripufa.pdf
    • https://cdn.sqhk.co/webuzifinuno/6tjjmVq/grass_cutter_animal_farming.pdf
    • https://sojagifuwolu.weebly.com/uploads/1/3/4/6/134689160/6794c068db37863.pdf
    • https://cdn.sqhk.co/bijukipuj/sxsicE0/cahier_des_charges_fonctionnel_site_web.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://zajoneforisomi.rf.gd/smart_siding_reviews.pdf
    • https://50037ee0-0691-4a53-bdc2-b2f8f795cfa6.filesusr.com/ugd/b41a9a_7ffe1e9c05444c8f80015988e4e5a91d.pdf?index=true
    • https://45f91bdd-2b68-4e60-ae2c-b14373ae5332.filesusr.com/ugd/0d089b_6f3d9afd97174c1184aa137be4971180.pdf?index=true
    • https://uploads.strikinglycdn.com/files/b641b562-44e1-4aec-9e0b-48357a936b59/how_to_write_a_conclusion_of_a_paragraph.pdf
    • https://uploads.strikinglycdn.com/files/9720c118-8003-4526-a9f1-55518ff6412c/51716298656.pdf
    • https://2863666b-9d79-467d-9aad-9eeb6dafbdf2.filesusr.com/ugd/6ee3eb_feedad80aa754868a9a658da07d2769e.pdf?index=true
    • https://uploads.strikinglycdn.com/files/8315a057-8f35-4899-b367-ef10c67b28d1/el_viaje_definitivo_analisis_estilistico.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef01.bin
6ed7bcc395777ed53aaaa99769a3d32d48c803ffc0647a9b5e7bdf50fb64e5fc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF01 5524 bytes
font_01_sfnt_off000101d5.bin
41d2abf713891e6316a918300443c496339a95414801fd406c4a39165b76bce6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x101D5 11020 bytes
font_02_sfnt_off000127af.bin
091385a096dd5c4abe473657744938a66ec68758812fc010bd7fa5d2fe82d11f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x127AF 16568 bytes
font_03_sfnt_off00013e6d.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13E6D 4324 bytes

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