Malicious PDF — malware analysis report

Static analysis result for SHA-256 66388b4b965beae2…

MALICIOUS

PDF

83.0 KB Created: 2021-02-23 19:50:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 14a3ea80ed9f3ceb3a05099813744a17 SHA-1: 95bd42660aae0d3e09fc183c05396d309449a254 SHA-256: 66388b4b965beae20d10c6f4a12ae9f46cac8b3da3ac539085357d15284da786
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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.
  • 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://druttle.ru/123?utm_term=dibujo+del+modelo+atomico+de+erwin+schrodinger PDF link annotation
    • https://cdn.sqhk.co/nakunadubux/nNjdie3/javelin_master_7_days_to_die.pdfIn PDF document text
    • https://vopoxeja.weebly.com/uploads/1/3/5/3/135346001/nosegimozinoreso.pdfIn PDF document text
    • http://cardioactiveuficiale.site/drag_racing_game_guardian_hackelmr9.pdfIn PDF document text
    • http://harmony-market.ru/what_is_gemstone_meaningac0lx.pdfIn PDF document text
    • https://noregodexu.weebly.com/uploads/1/3/1/8/131871467/969915.pdfIn PDF document text
    • https://povaxabo.weebly.com/uploads/1/3/5/9/135976235/lofivejedejekopud.pdfIn PDF document text
    • http://xisulekotitis.iblogger.org/nabetubitutegenoraju.pdfIn PDF document text
    • https://xadularapiro.weebly.com/uploads/1/3/1/4/131437383/1425081.pdfIn PDF document text
    • http://help-business-media.com/fuvevujabexuwizokokedepas8w96l.pdfIn PDF document text
    • https://tulapubilogu.weebly.com/uploads/1/3/4/8/134881906/bujotojagaxatam.pdfIn PDF document text
    • http://rekopeza.22web.org/fimefibaxemukix.pdfIn PDF document text
    • http://pakavoposot.22web.org/alpolic_fr_certificate_of_conformity.pdfIn PDF document text
    • https://resewirebibabap.weebly.com/uploads/1/3/1/3/131379054/rijojuledibisunak.pdfIn PDF document text
    • https://cdn.sqhk.co/niririga/0iihTrA/truc_de_grand_mere_contre_la_constipation.pdfIn PDF document text
    • https://cdn.sqhk.co/wanevakaxuma/jjiEgcU/69797417990.pdfIn PDF document text
    • https://tadeliganunuzax.weebly.com/uploads/1/3/0/9/130969808/waxosasuda.pdfIn PDF document text
    • https://cdn.sqhk.co/lexoxuxoluvi/7ggddih/95359778709.pdfIn PDF document text
    • https://cdn.sqhk.co/sogefuluf/9hfjcya/bingo_tea_chinatown_chicago.pdfIn PDF document text
    • http://womenit.space/basketball_game_download_apkop5fs.pdfIn PDF document text
    • http://matanusebatug.22web.org/zurafe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://wokeben.epizy.com/play_store_app_free_new_version.pdfIn PDF document text
    • http://zumoriko.epizy.com/arere_yekkada_instrumental_song.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD08 5540 bytes
SHA-256: a1c89798b5b740179ae3a7ff664f7f2ce06045e2ca3200f65e6b49d1a203047f
font_01_sfnt_off0000efb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFB5 13176 bytes
SHA-256: 7db797673ebaa2f0d3caef55d74ad9bfdc1659a18b6025f2a951bdd04aae3aef
font_02_sfnt_off00011b06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B06 16116 bytes
SHA-256: 757edbe9ca696dc752e8794cc2fab55b744a24b197aba41abea0c8f583a0f3ca
font_03_sfnt_off00012fe2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FE2 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34