Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0016a775360aaf0…

MALICIOUS

PDF

86.3 KB Created: 2021-04-02 17:44:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 7021bb2370db12da3df5821cc668267a SHA-1: 6dfef0f57c72e14a904ad1c3b8a43b61b83fbd42 SHA-256: c0016a775360aaf07e6dc1614ed19e2edbbd8fbf6101537a058330bffc5894d4
126 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan payload. The document body, though heavily obfuscated, appears to be a lure related to 'Atlas copco air compressor repair services'. It contains numerous embedded URLs, with a primary suspicious URL being https://baarspo.ru/strik. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests a link farm designed to host malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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/strik?utm_term=atlas+copco+air+compressor+repair+services+near+me PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4469633/normal_5fc585fec9992.pdfIn PDF document text
    • http://nesorus.mywebcommunity.org/37363893678.pdfIn PDF document text
    • http://jadogaxarabu.mygamesonline.org/colored_pencil_drawing_ideas_easy.pdfIn PDF document text
    • http://lorakuze.sportsontheweb.net/16169805605.pdfIn PDF document text
    • http://rubolanir.mypressonline.com/37694495696.pdfIn PDF document text
    • http://saniwigudovo.scienceontheweb.net/88893486698.pdfIn PDF document text
    • http://fujigukatujewu.medianewsonline.com/does_delta_sonic_do_inspections.pdfIn PDF document text
    • http://kugaraginoja.mypressonline.com/41722742212.pdfIn PDF document text
    • http://nepoxiduvilej.scienceontheweb.net/full_body_workout_routine_at_home_without_equipment.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444098/normal_605c882de6829.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403131/normal_5ffd6f2b97507.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380882/normal_5fec27d4da278.pdfIn PDF document text
    • http://vuwefedope.sportsontheweb.net/sc_caste_list_in_maharashtra.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412379/normal_5ff1ea60dad55.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://fae5df41-d68b-4d62-9961-cd33801cec7e.filesusr.com/ugd/f52c73_bd8f66cd2ca24457af1d981f5d952654.pdf?index=trueIn PDF document text
    • http://xakagigoneliv.myartsonline.com/xekam.pdfIn PDF document text
    • http://tofilijewok.atwebpages.com/attestation_d_accueil_france.pdfIn PDF document text
    • https://79ab8074-8148-4faa-9219-f6cdfa35bc15.filesusr.com/ugd/99e004_1f2fb8b9079f423898b2fa11a20b7e2c.pdf?index=trueIn PDF document text
    • https://9849c7ec-8b19-4b81-9a64-db2537ea7c40.filesusr.com/ugd/97b1c0_086da3d112dc4031a511d55ab6a1f57f.pdf?index=trueIn PDF document text
    • https://469ee322-798e-4c1d-9571-af6764901f97.filesusr.com/ugd/57169b_0f9fa446e661490586c300b1c55a7647.pdf?index=trueIn PDF document text
    • http://kibagog.onlinewebshop.net/netbeans_8._2_complete_tutorial.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_off00011456.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11456 5128 bytes
SHA-256: 34a3bc3baf4d47714045eee518d8788fc78acf10beaf98d7ef634d254608a7e2
font_01_sfnt_off000125ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125BA 11120 bytes
SHA-256: d41ae7a69f12e2a2fd9ae2a71a5a5ec2c70207b0c4ae3618c3f7fcfce41992dd

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