Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf6e95f96331eae8…

MALICIOUS

PDF

76.6 KB Created: 2021-03-14 09:57:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 71a2bb53c3961d24489f020cadf09f24 SHA-1: f5facd23c1ba0ba9c9f7729c26f5bb942008db93 SHA-256: bf6e95f96331eae8261e606180b6caf4d118a2c1d635b5e7321051e8262ee174
126 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with one specifically identified as a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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
  • 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://baarspo.ru/award?keyword=college+panda+math+book+pdf PDF link annotation
    • http://pek-24.cc/wugowabomedifozamuduuewqo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422640/normal_601fac89e37d0.pdfIn PDF document text
    • http://spiritstudio.ru/aggiornamento_huawei_p20_lite_android_9mxlsd.pdfIn PDF document text
    • http://myfavoritesun.xyz/how_to_study_korean_website_reviewtu2ij.pdfIn PDF document text
    • http://gakagebir.mypressonline.com/what_is_skin_so_soft_good_for.pdfIn PDF document text
    • http://nubilofanekib.mygamesonline.org/simple_human_soap_dispenser_red_light.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367645/normal_5ff249d9310fd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4427284/normal_5fff606e6dfc4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4488323/normal_5ff5b063cc298.pdfIn PDF document text
    • http://dobilarujokux.sportsontheweb.net/28922982252.pdfIn PDF document text
    • http://rivozuzeno.mywebcommunity.org/elements_of_design_color_picker.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393779/normal_5fdcce09164ff.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451945/normal_603ed64d79fbf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410214/normal_602b367be8d4a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388825/normal_5fe51cc4455f8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418391/normal_603f23a001be6.pdfIn PDF document text
    • http://pikogoxo.iblogger.org/wukizipibenemozojosujux.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489255/normal_5fe5b3d1a146a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://fac30f9c-1bc3-4ff6-ac40-7ced1d2a170b.filesusr.com/ugd/3b7182_44beb21e7e804d38839fa5f608462e6e.pdf?index=trueIn PDF document text
    • https://b9eb3541-094c-4606-b101-17c2291fd6e1.filesusr.com/ugd/a18601_54b1470b3daa4b3d8ae3eb6b73347879.pdf?index=trueIn PDF document text
    • https://77483064-5892-4b52-b419-66e751946b77.filesusr.com/ugd/ef7b09_d4a1a87447b0459ead0ab67ff420a61b.pdf?index=trueIn PDF document text
    • https://f6142301-0c02-44dd-b2c5-62cf9b3cd0dc.filesusr.com/ugd/ebfdba_12be377b58ab4dbdb155f2794195b213.pdf?index=trueIn PDF document text
    • https://eee7329a-c4d5-4508-a8fd-a8ba515f7d9f.filesusr.com/ugd/5ed802_5796369b39d447078c24fae86d609e90.pdf?index=trueIn PDF document text
    • http://vodadusilop.rf.gd/ancient_dracolich_5e_stats.pdfIn PDF document text
    • http://nibopinalilabaj.onlinewebshop.net/bushnell_yardage_pro_scout_review.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_off0000ec94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC94 5288 bytes
SHA-256: 4cd0dfbaf5d0b777da19690366fcd5a68b0cdc62ce6c9906e48e3ac09c994200
font_01_sfnt_off0000fe6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE6B 11400 bytes
SHA-256: 223b672f9942139bb9e09fcb9a8ba90fe73c03c1b75bf45fd3277dd9be86f915