Malicious PDF — malware analysis report

Static analysis result for SHA-256 10058d6aa87ec2cb…

MALICIOUS

PDF

85.5 KB Created: 2021-03-16 04:57:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: ce864493eb27813d78d87961a4f37279 SHA-1: 93e52c2d10ac10a15ccd4495b6673072d0742532 SHA-256: 10058d6aa87ec2cbd46c94a3a9637845229439d2df7ebb79e1e8ad3a794f440a
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 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://nipisod.ru/123?utm_term=chemotherapy+extravasation+guideline PDF link annotation
    • http://netzamka.ru/nx_reverse_engineeringz9icp.pdfIn PDF document text
    • https://cdn.sqhk.co/subogutaze/iiqzijx/tatidujomozubuxelenavezu.pdfIn PDF document text
    • https://cdn.sqhk.co/fuvebopeweb/jegeqhh/froggers_mount_dora_specials.pdfIn PDF document text
    • http://lunotikipadul.66ghz.com/application_of_gis_in_forestry.pdfIn PDF document text
    • http://1freedom.space/najisijiloronezasutaberilvndnh.pdfIn PDF document text
    • https://cdn.sqhk.co/jotepomi/gh7jeiV/1359869825.pdfIn PDF document text
    • http://idealica-uficiale.website/rubivawujatamujagevv7s9j.pdfIn PDF document text
    • http://fresh-ita.fun/98953725245sb3n9.pdfIn PDF document text
    • http://fojukuju.iblogger.org/lomasisexurojidonanojose.pdfIn PDF document text
    • https://cdn.sqhk.co/detaludolef/xheUjgI/mediaf_re_downloader_online.pdfIn PDF document text
    • https://cdn.sqhk.co/pidodalatip/gjimzDY/15949340921.pdfIn PDF document text
    • https://cdn.sqhk.co/dutimapo/lnhbKge/wedding_hair_nyc.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wabagibopuxar.rf.gd/63025306239.pdfIn PDF document text
    • https://s3.amazonaws.com/tipikaxe/89107227831.pdfIn PDF document text
    • https://s3.amazonaws.com/rovuweraja/jakoniwopowozagabatupob.pdfIn PDF document text
    • https://acfcda0b-1795-4b40-aedc-9a0bc13047ce.filesusr.com/ugd/89c6ad_6cfcd31cb9464e509bea6b96baad2b46.pdf?index=trueIn PDF document text
    • https://ab60d57a-1f92-408f-9079-0b325776b613.filesusr.com/ugd/724fb5_35e74399aeeb4859895c4a0a3d2eb419.pdf?index=trueIn PDF document text
    • https://9849c7ec-8b19-4b81-9a64-db2537ea7c40.filesusr.com/ugd/97b1c0_0fd71ee4ff654ae2a37f57daa7423b06.pdf?index=trueIn PDF document text
    • https://ef4b221f-cfb4-47e8-bf1d-3b5092770df7.filesusr.com/ugd/4948da_ede22772d2924b85ba68d65f20303287.pdf?index=trueIn PDF document text
    • http://jawevobafepen.epizy.com/apta_guidelines_for_student_supervision.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_off0000f8c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8C4 5508 bytes
SHA-256: d69e7e70b715d425a15046a4c5a0ce3d95e699cf9de1e921464df98310fa1372
font_01_sfnt_off00010b5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B5D 11644 bytes
SHA-256: 924c6f9a37d828732660b3557948c55ecba74bfd30436c6b570b1bbf44ec31b9
font_02_sfnt_off0001331a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1331A 16204 bytes
SHA-256: e93acd332f5893643511f4cefd38969ad5c744ad1b08842a788b6be7d277dd15

Open this report in the interactive analyzer, or submit your own file for analysis.