Malicious PDF — malware analysis report

Static analysis result for SHA-256 748768755600b735…

MALICIOUS

PDF

78.0 KB Created: 2021-04-01 23:49:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 5d26892cf58f010a1a6f225e59e8961f SHA-1: e04b70225bc12cb17beb436bec8d9f2abab376f9 SHA-256: 748768755600b735e2e28b831eabe5eb4e92520cde6668fb22fa00754eed2c98
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which point to disposable hosting and are part of a link farm, indicating a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. The document body, though partially corrupted, suggests a lure related to fixing a stapler, which is likely a pretext to direct users to the malicious URL.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://lozipotod.ru/strik?utm_term=how+to+fix+a+stapler+that+won%2527t+staple PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4425913/normal_5fdbdb2b63e4a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368479/normal_605fa70a94708.pdfIn PDF document text
    • http://xubanapirobula.mypressonline.com/waxifunobuzodojosulitetig.pdfIn PDF document text
    • https://cdn.sqhk.co/vifejoneses/jjgicn2/tixovovutikazozi.pdfIn PDF document text
    • http://kiritisivasol.mywebcommunity.org/jefibo.pdfIn PDF document text
    • https://cdn.sqhk.co/serodozire/fgfd3QE/fokoxanujotena.pdfIn PDF document text
    • https://cdn.sqhk.co/lokijuzim/jLp6jcz/rock_music_2019_new_songs.pdfIn PDF document text
    • http://tafiwon.mywebcommunity.org/someone_like_you_adele_piano_chords_easy.pdfIn PDF document text
    • http://lomuwugevona.getenjoyment.net/bose_av3-2-1_ii_gsx_media_center.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479236/normal_5fe91b343292e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4392442/normal_5fef18605d77a.pdfIn PDF document text
    • https://cdn.sqhk.co/fofanibiv/ejcjdqI/pufakabejisejeluwekorave.pdfIn PDF document text
    • http://rixuliketasaban.mywebcommunity.org/easy_beautiful_piano_songs.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393641/normal_601ac5ba3097f.pdfIn PDF document text
    • https://cdn.sqhk.co/kanedufopuma/5btIjju/89732361875.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/7e41e264-23b5-4ba3-9a68-8781552a5974/65418529817.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/01b1d805-2c02-4c77-bfe8-3705bf60b94e/what_are_smaller_units_of_length.pdfIn PDF document text
    • http://jilazarow.rf.gd/formule_avion_hotel_prague.pdfIn PDF document text
    • http://sogivuwe.onlinewebshop.net/psalm_23_4-6_kjv.pdfIn PDF document text
    • http://moxosisir.epizy.com/jejimavewom.pdfIn PDF document text
    • http://vawerudarasikow.myartsonline.com/4148761930.pdfIn PDF document text
    • http://gugogedufos.epizy.com/agile_uat_test_plan_template.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_off0000f4d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4D2 5144 bytes
SHA-256: 43cc0fd5220a4d397cc2a1ea6e1445aff86c88a0479df7303dddd60d75c94482
font_01_sfnt_off00010666.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10666 10672 bytes
SHA-256: e82e24bbec2692bf0226eea2c34447ffe92dc3adfd889d8394067ffe9a6aaa07

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