Malicious PDF — malware analysis report

Static analysis result for SHA-256 780522121627b8cb…

MALICIOUS

PDF

77.7 KB Created: 2021-02-09 22:51:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 04e3be2bf1311c6befd604e54adf5ba8 SHA-1: 8690341cb25e193755289acd08a4b643c9fdb891 SHA-256: 780522121627b8cb710bdb82393d3f1af5be2b23d924c663fb37b10dabd40443
194 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with at least one identified as a malicious redirector. The document body, though heavily obfuscated, suggests a lure related to a 'worksheet'. The presence of these links and the ML classification strongly indicate a phishing or malware distribution attempt. No scripts were extracted, but the PDF structure itself facilitates the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://yafferge.ru/123?utm_term=mapping+ocean+floor+worksheet In PDF document text
    • http://vavawosasote.iblogger.org/danger_chamar_2_video_song.pdfIn PDF document text
    • http://pubolovuwete.iblogger.org/51981449827.pdfIn PDF document text
    • https://cdn.sqhk.co/teposodigar/Jhibzif/91220648438.pdfIn PDF document text
    • http://wusujobarowi.22web.org/rovuzagujadagedif.pdfIn PDF document text
    • https://cdn.sqhk.co/jusupovexewa/cT7708V/fedinaliwunipuge.pdfIn PDF document text
    • http://invitesistem.ru/xuwegutopovarizageriduvadrboib.pdfIn PDF document text
    • http://detonicinitalia.website/livro_de_direito_processual_civil_esquematizadoalomw.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sebavorapu.rf.gd/anemia_guidelines.pdfIn PDF document text
    • https://s3.amazonaws.com/garorowa/43777748210.pdfIn PDF document text
    • http://runoxujozu.rf.gd/janapada_dj_songs_video.pdfIn PDF document text
    • http://kutugujipix.epizy.com/windows_10_version_1903_iso.pdfIn PDF document text
    • https://s3.amazonaws.com/pidufozu/journeyman_carpenter_resume_template.pdfIn PDF document text
    • https://s3.amazonaws.com/mujesogi/yourtv_perth_tv_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/nunakixuma/laminates_catalogue.pdfIn PDF document text
    • https://s3.amazonaws.com/vaxebisapesi/descargar_biblia_de_estudio_mundo_hispano.pdfIn PDF document text
    • https://s3.amazonaws.com/kosipefojaw/calluna_sans_regular_font_free.pdfIn PDF document text
    • https://s3.amazonaws.com/penefelomiju/klaveness_combination_carriers_as_annual_report.pdfIn PDF document text
    • http://begalokatixatu.epizy.com/lupamenibixitu.pdfIn PDF document text
    • https://s3.amazonaws.com/jiguwuzobozobaz/51851926635.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
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dcbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCBB 5436 bytes
SHA-256: 55fa889e6757091485ce1d0f245291948367b981c9df67d0a6c9d59eff325025
font_01_sfnt_off0000ef5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF5C 10816 bytes
SHA-256: a187c58467762914c14348e6d7af6a1f3758b3fa0ee32ecf5f9d2aff48eae36b
font_02_sfnt_off00011460.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11460 16168 bytes
SHA-256: bcfecb9fde4b74e4a2b692e15caf305b2988a1cfe4c6386614002e38d35feb86

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