Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb1f576c5ec4cf57…

MALICIOUS

PDF

71.5 KB Created: 2021-05-09 01:44:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ef8f40d89af8b89949cac48048492622 SHA-1: 485380a36af9077482d46089ffe6f1bd225441a2 SHA-256: bb1f576c5ec4cf570486d8051fe7ade8e27af64f7b8b233623b8ce390936e6de
96 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with one prominent URL pointing to a suspicious domain ('jacksth.ru') that is likely part of a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the presence of external URIs and the overall detection suggest the document is designed to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 4

  • 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://jacksth.ru/strik?utm_term=desarrollo+humano+papalia+feldman+libro+pdf
    • http://zaxukifo.22web.org/24987689234.pdf
    • https://cdn.sqhk.co/kevapaboxer/ihEifhg/86410151388.pdf
    • https://cdn.sqhk.co/tudosiki/ijjehbJ/guxezoxepojilagekaz.pdf
    • http://nunakazesimu.22web.org/antigua_and_barbuda_visa_form.pdf
    • http://sait-ok.ru/81737640325tpd51.pdf
    • https://cdn.sqhk.co/tamejenonisi/eYxZjjc/juwox.pdf
    • https://cdn.sqhk.co/bunewonu/idZifTz/fimamopetodutozufuj.pdf
    • http://hookup681.site/801099832088si9u.pdf
    • http://100naturals.fun/square_enix_games_pc5kwki.pdf
    • http://matteset-spon.space/241454882727rxmw.pdf
    • https://cdn.sqhk.co/jogekiluse/7xZgehh/nibipazojekozomoretodun.pdf
    • http://mokajuziwasuto.22web.org/stoker_biochemistry_free.pdf
    • http://gutufozif.iblogger.org/10166905068.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/4f40417a-0dba-4030-801f-93152b864a6b/84544911974.pdf
    • http://nipimixo.epizy.com/zawigiluvinedisikoruxotuf.pdf
    • http://duzesonugineku.rf.gd/reduce_smaller_size.pdf
    • https://s3.amazonaws.com/wixamupelinere/83431316468.pdf
    • http://rowisumemosil.rf.gd/fender_mustang_amp_70w.pdf
    • https://s3.amazonaws.com/fupanabivote/wadunez.pdf
    • https://uploads.strikinglycdn.com/files/88ed651d-f628-4847-8b45-ef1b32175716/41396002087.pdf
    • http://falivodekolulo.epizy.com/80460706541.pdf
    • https://s3.amazonaws.com/jakujakula/where_is_the_tree_of_life_located_in_washington.pdf
    • http://kozukoriz.epizy.com/vogakomarovunuvi.pdf
    • https://s3.amazonaws.com/wupiwupiwot/51677636788.pdf
    • https://uploads.strikinglycdn.com/files/909a8abc-77b1-483e-aee2-54d715161250/barapisitivunipudinuxaz.pdf
    • https://s3.amazonaws.com/gumagabu/59032835177.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_off0000d410.bin
096ecf6a043229a534b83e1ee280a62dbe47f7c1573d8ad55fea14f2e61ac7e2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD410 5420 bytes
font_01_sfnt_off0000e64f.bin
c75098bf55ded06e4fe8f1463ecc056874997f7b68ca2c258c35578914291b60		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE64F 12324 bytes

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