Malicious PDF — malware analysis report

Static analysis result for SHA-256 b458ab6be62a98c5…

MALICIOUS

PDF

78.1 KB Created: 2021-04-01 06:51:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 67c09a9fbfebecddb94a79a7b3006ad5 SHA-1: 9af3d160376dbfac0658ab37ed982c4330635915 SHA-256: b458ab6be62a98c5f4408b0ccb4d4076b6aef1e7fcd6663ddadaf6b45a4e9e4a
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 0.9992

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://bologen.ru/wix?keyword=mblex+study+guide+2017+free PDF link annotation
    • https://fadegoke.weebly.com/uploads/1/3/5/9/135990174/miganigekiki.pdfIn PDF document text
    • https://cdn.sqhk.co/pipezifiwip/hg83rhf/mcdonald_s_breakfast_hours_weekend.pdfIn PDF document text
    • https://cdn.sqhk.co/tamupoto/3jdhfib/age_of_warring_empire_cheats.pdfIn PDF document text
    • http://sfhgfje5df.xyz/8th_grade_math_skills_assessmentn3jtx.pdfIn PDF document text
    • https://cdn.sqhk.co/nobixapo/chRsYij/jikuwa.pdfIn PDF document text
    • https://sojoxatufuwi.weebly.com/uploads/1/3/4/7/134710771/ec08106d1bb4.pdfIn PDF document text
    • https://lafikekil.weebly.com/uploads/1/3/4/3/134316660/gigifutugixe.pdfIn PDF document text
    • https://ganalazukomej.weebly.com/uploads/1/3/4/7/134714395/tewavavexinotu-vavojav.pdfIn PDF document text
    • https://cdn.sqhk.co/wekababu/wjgnknL/short_barber_cuts_for_black_females.pdfIn PDF document text
    • https://cdn.sqhk.co/koditisalupe/hcgcPtL/84948321115.pdfIn PDF document text
    • http://spencermcman.us/the_secret_to_attracting_money_workbdgse3.pdfIn PDF document text
    • https://kimetupuvojum.weebly.com/uploads/1/3/2/6/132680977/bowigakuwagize-nifage-lapedor-dobeposegabojek.pdfIn PDF document text
    • https://cdn.sqhk.co/barosevarega/ehiiehc/dexikivikosu.pdfIn PDF document text
    • https://neposuxanu.weebly.com/uploads/1/3/0/7/130740617/gopobem.pdfIn PDF document text
    • https://levunabul.weebly.com/uploads/1/3/1/4/131407164/wowitowi.pdfIn PDF document text
    • https://zediruli.weebly.com/uploads/1/3/4/7/134725524/1056971.pdfIn PDF document text
    • https://cdn.sqhk.co/sakajererudi/DmifLgj/avista_window_rebate_form.pdfIn PDF document text
    • http://fatowafelu.iblogger.org/gaborojowij.pdfIn PDF document text
    • http://musofiron.ru/aptitude_test_with_answere8nnv.pdfIn PDF document text
    • https://velalozelo.weebly.com/uploads/1/3/4/4/134498802/vuxixevewuju-gexoduwupul-pobes.pdfIn PDF document text
    • https://povemiloten.weebly.com/uploads/1/3/4/6/134608376/puxasofawibisanek.pdfIn PDF document text
    • http://oneitshop.pro/patiwidurupd073x.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nuxiluruzijova.epizy.com/siwunajuja.pdfIn PDF document text
    • http://jujiruwer.rf.gd/basic_digital_circuits.pdfIn PDF document text
    • http://guvonudigadosa.epizy.com/learning_opencv_3.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_off0000f2b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2B4 5584 bytes
SHA-256: c472e9a44d0fbf62b4a0297c1bce881ac400688a72bb42bedd766a6e542fa308
font_01_sfnt_off000105f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105F1 10836 bytes
SHA-256: f5c2a0a0c8c6f8b2beae5590f7ac9ad9198a9ba28d547bb8140492dc15e19130