Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c6389b93e58a31f…

MALICIOUS

PDF

77.1 KB Created: 2021-03-27 14:17:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 1527b50f18a19b99d22b1c2e924a9cf4 SHA-1: 7420b78ff11b9c9cef8d1719c9947c998ac2f76b SHA-256: 6c6389b93e58a31fca0cad865d6872629fef96700584d793555e52b151ba562c
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains multiple embedded URLs, with at least one identified as a malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the presence of numerous links suggests an attempt to drive traffic to external, potentially harmful, sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://crophysi.ru/award?keyword=business+management+course+pdf In PDF document text
    • https://cdn.sqhk.co/retepisej/hghdif3/plants_vs_zombies_heroes_apk_mod_unlimited_sun.pdfIn PDF document text
    • http://granitmetrospecstroy.ru/schroeder_thermal_physicstktj6.pdfIn PDF document text
    • http://static-start.top/75313390574vzx9s.pdfIn PDF document text
    • http://rabevazilogu.iblogger.org/44697871124.pdfIn PDF document text
    • http://ziwavabewite.66ghz.com/46769621025.pdfIn PDF document text
    • http://zozegakipuvi.iblogger.org/caravan_guided_tours_nova_scotia.pdfIn PDF document text
    • http://vykupavto54.ru/24353805055fl72y.pdfIn PDF document text
    • https://cdn.sqhk.co/mudifuto/jb6hdWX/romolovaforivuradige.pdfIn PDF document text
    • http://rijupoxog.22web.org/lsu_gymnastics_injury_report.pdfIn PDF document text
    • https://cdn.sqhk.co/totimujid/Fidgfia/crash_team_racing.pdfIn PDF document text
    • http://vinnipoh.space/cancers_of_the_blood-_forming_tissues1a6u0.pdfIn PDF document text
    • https://cdn.sqhk.co/rogapakaler/aheigl1/botanelizelujoroxaxonela.pdfIn PDF document text
    • http://usecabinets.xyz/38540027188qypbh.pdfIn PDF document text
    • http://dikerulaba.22web.org/dinupim.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lipetefafozil.epizy.com/contax_g1_review_ken_rockwell.pdfIn PDF document text
    • http://xivajaraseb.rf.gd/python_string_format_escape_quotes.pdfIn PDF document text
    • http://tiladolukix.rf.gd/catasterismi_eratostene.pdfIn PDF document text
    • http://beposutixavi.epizy.com/24470152744.pdfIn PDF document text
    • http://kagokonutuvep.epizy.com/36738490754.pdfIn PDF document text
    • http://jigategire.epizy.com/23029809885.pdfIn PDF document text
    • http://mibavened.rf.gd/luromorutam.pdfIn PDF document text
    • http://bubexixan.epizy.com/nidijuxepexapesuna.pdfIn PDF document text
    • http://lojojijozopixaz.epizy.com/86093288012.pdfIn PDF document text
    • http://tepijivazijovij.epizy.com/apttus_cpq.pdfIn PDF document text
    • http://ditinalozevid.epizy.com/format_for_applying_bonafide_certificate.pdfIn PDF document text
    • http://xenuduximowub.epizy.com/57640900427.pdfIn PDF document text
    • http://lavodusepigixu.rf.gd/77993658663.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE92 5492 bytes
SHA-256: 11d25f4cf8a88618747d60953176c66f6e671e711342e0c4b75530b8c656ca01
font_01_sfnt_off0001012f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1012F 11080 bytes
SHA-256: 3dc0cefe5e69e7c7cc12eda89719846cc30e8752fa18037e300e97a0ee8b9797

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