Malicious PDF — malware analysis report

Static analysis result for SHA-256 821e73a882cc936b…

MALICIOUS

PDF

81.1 KB Created: 2021-03-12 06:53:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 087fd42725764e8612f902cc4e3707bd SHA-1: 505969acde79e4de8c3cdab1ffbd014a32b23d87 SHA-256: 821e73a882cc936bb6847e34418b6cf3f0868dcfe107c8ac04a3b1d038978bff
96 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating the presence of external URIs and embedded URLs. The primary malicious URL, https://zajinet.ru/award?keyword=gastroenteritis+akut+pdf+idai, suggests a phishing or credential harvesting attempt. Although no scripts were explicitly extracted, the PDF structure and embedded URLs strongly indicate a social engineering attack, likely spearphishing, to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://zajinet.ru/award?keyword=gastroenteritis+akut+pdf+idai
    • https://cdn-cms.f-static.net/uploads/4387928/normal_60464387a587d.pdf
    • http://mimedilubaj.22web.org/78712969367.pdf
    • http://pimolala.22web.org/valosej.pdf
    • https://jibizixowaxen.weebly.com/uploads/1/3/5/2/135296653/2194141.pdf
    • https://fenazimo.weebly.com/uploads/1/3/4/4/134437137/nimuzebawilaxezu.pdf
    • https://cdn-cms.f-static.net/uploads/4386849/normal_602f251e6ab23.pdf
    • https://static.s123-cdn-static.com/uploads/4415302/normal_5ff51ab8ac650.pdf
    • http://mpvideo.org/how_to_do_task_analysis06sdc.pdf
    • https://sibevuguz.weebly.com/uploads/1/3/4/8/134859718/709a4f2.pdf
    • https://cdn-cms.f-static.net/uploads/4449775/normal_600b557c03cde.pdf
    • http://abwaab.su/vicks_cool_mist_humidifier_walmart_canada82udv.pdf
    • http://vifubavawet.mygamesonline.org/english_punctuation_test.pdf
    • https://rebejudan.weebly.com/uploads/1/3/5/3/135316845/358977ba179e.pdf
    • https://cdn-cms.f-static.net/uploads/4409819/normal_602f7a3b86a7c.pdf
    • http://milesnires.xyz/the_death_of_empedoclesnfm8s.pdf
    • http://kesuvajeb.scienceontheweb.net/10904568324.pdf
    • http://fomijegi.mypressonline.com/dd_monster_name_generator.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://sanugifop.atwebpages.com/jogerowej.pdf
    • http://gajijijada.rf.gd/78991543234.pdf
    • http://ruvemad.myartsonline.com/algae_as_biofuel.pdf
    • https://9eff4bf0-55a5-42b9-a65a-250f23c32afd.filesusr.com/ugd/80978b_39a173a0a76d418ea4f2c961f9fb3e8f.pdf?index=true
    • http://sikejafomanama.epizy.com/acr_mammography_compression_guidelines.pdf
    • https://12c9c681-cafc-4f88-93da-cb6f471fd49a.filesusr.com/ugd/f09a9d_bed956f8fc474970b41807fc672c1dc2.pdf?index=true
    • http://lamafuravufezin.epizy.com/game_bully_ps2_offline.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_off0001006e.bin
9f9710fbdd7722eec085efea1ee906856fb54d906f4783abaf74b868cf836236		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1006E 5096 bytes
font_01_sfnt_off000111dc.bin
80b874101198d3fabd0a9c50af21e95a48db6759ca5b6ef2b76be610d95ceb7c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x111DC 10744 bytes

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