Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c408b1b22a2485e…

MALICIOUS

PDF

97.6 KB Created: 2021-02-27 03:31:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 84ce9ea75201bdda1da05f80bcd03cb7 SHA-1: 6339980427e2b3fc7356c90e4154ec0228d207cc SHA-256: 6c408b1b22a2485e9555216c49a3e180a1c4e761a058c81e97c44d0ee21ce43a
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains and link farms, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and a specific anime term, likely a lure to disguise the malicious nature of the links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • 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 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=what+is+inosuke+breathing+technique PDF link annotation
    • https://cdn.sqhk.co/fegozanodedu/BeLEggv/monob.pdfIn PDF document text
    • https://pakoverixofe.weebly.com/uploads/1/3/4/7/134771358/tixipubu.pdfIn PDF document text
    • http://luwogexejel.getenjoyment.net/sap_hana_basis_tutorial.pdfIn PDF document text
    • http://nigavereke.mygamesonline.org/81458474308.pdfIn PDF document text
    • http://mapotilij.mygamesonline.org/how_do_i_change_the_time_on_my_panasonic_landline_phone.pdfIn PDF document text
    • https://cdn.sqhk.co/xodakebebit/fQXujbB/low_sugar_raspberry_freezer_jam_no_pectin.pdfIn PDF document text
    • http://vifezitenof.getenjoyment.net/41483036386.pdfIn PDF document text
    • https://weralafopibobal.weebly.com/uploads/1/3/4/3/134338927/b39bc9.pdfIn PDF document text
    • https://zasevolonuto.weebly.com/uploads/1/3/5/3/135335071/9793566.pdfIn PDF document text
    • https://cdn.sqhk.co/fivuwunar/iN8tduu/tevalasubatafoniro.pdfIn PDF document text
    • https://cdn.sqhk.co/dejijadu/ghHUhic/sniper_gang_logo_black.pdfIn PDF document text
    • https://rapusixub.weebly.com/uploads/1/3/4/6/134631860/5405453.pdfIn PDF document text
    • http://linavaluviriv.getenjoyment.net/reality_transurfing_by_vadim_zeland_-_steps_i-v.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://rosukijabadizi.epizy.com/15723662110.pdfIn PDF document text
    • https://s3.amazonaws.com/wupixufekijax/73767610191.pdfIn PDF document text
    • http://buwijakuwomem.rf.gd/salosuvisimafidewiwo.pdfIn PDF document text
    • http://donijexufenu.onlinewebshop.net/levudewe.pdfIn PDF document text
    • http://gobonelore.epizy.com/nevotufowinujuwu.pdfIn PDF document text
    • http://nejesezape.myartsonline.com/94152467061.pdfIn PDF document text
    • http://nowakimelufumi.epizy.com/plantronics_backbeat_fit_2100_reset.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000103ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103ED 15156 bytes
SHA-256: 3ec604233a69d5692391d9fd685284d0692af40357bcce081bd8ad352895af0b
font_01_sfnt_off0001346a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1346A 5256 bytes
SHA-256: e1138d4e1d103899511142cc9df3da9e49525df920ac0a3c75bd4843e3761fa7
font_02_sfnt_off00014647.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14647 10700 bytes
SHA-256: 08e2581672c1751196667b24d0c1abdf2a2bc4dc99b700f6af6848674f89ed19
font_03_sfnt_off00016a81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16A81 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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