Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9cfc18054546a57…

MALICIOUS

PDF

75.1 KB Created: 2021-02-28 06:09:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: eed1819f47d01f54e70ae7857965fc6f SHA-1: b58c5fda2fa347c128a1662456c2045dea838756 SHA-256: b9cfc18054546a5783a54ccf9899e0b858b8f69fd07b73e099dc0c16dc2cdb11
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable domains, suggesting a link farm or phishing operation. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically identified as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://resalured.ru/strik?utm_term=how+to+install+nexus+mods+on+xbox+one PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4409258/normal_60085011bcd69.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480579/normal_6036baf300ba4.pdfIn PDF document text
    • http://tosefabebiribow.scienceontheweb.net/vajeburagadimenu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383571/normal_603acc0fc7d3b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378157/normal_602142359a75c.pdfIn PDF document text
    • http://zizodoroluxonaf.sportsontheweb.net/how_to_determine_which_solvent_to_use_in_recrystallization.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476446/normal_5fe89b33ebd2f.pdfIn PDF document text
    • http://sawemawe.mywebcommunity.org/retuzopipizijinutojobaj.pdfIn PDF document text
    • https://dofolemabumef.weebly.com/uploads/1/3/4/4/134458616/mavubisozoginezib.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446650/normal_6034f0d04dc89.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420767/normal_600f4c77d536b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501980/normal_5ff4da476a810.pdfIn PDF document text
    • http://fituxem.sportsontheweb.net/hpi_savage_x_4.6_steering_servo_upgrade.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456377/normal_60387052bc411.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/jeworurowam/loroxigepinidenolimim.pdfIn PDF document text
    • http://livixutufedesuv.epizy.com/best_ps2_emulator_for_pc.pdfIn PDF document text
    • http://besipopi.epizy.com/funolajilibununod.pdfIn PDF document text
    • http://tifavamifikas.myartsonline.com/how_to_restart_my_fitbit_charge_hr_2.pdfIn PDF document text
    • https://s3.amazonaws.com/geradi/not_acceptable_forms_of_id.pdfIn PDF document text
    • https://s3.amazonaws.com/kudufigunabi/apprendre_chinois.pdfIn PDF document text
    • https://s3.amazonaws.com/wizakokowe/51761681852.pdfIn PDF document text
    • http://bukarujinadir.epizy.com/2272197344.pdfIn PDF document text
    • http://tikigare.rf.gd/twilight_eclipse_2010_full_movie_in_hindi_free_download.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_off0000e9ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9CA 5136 bytes
SHA-256: 25c4655056feb1b9dd9736b18a69e2b6b2b380f0e11b467f1e0b2d5aa9f54ac1
font_01_sfnt_off0000fb3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB3E 10492 bytes
SHA-256: 30840983238b8d182213b72a7da69cbb72b4a73664c7cd239509965027b344c1