Malicious PDF — malware analysis report

Static analysis result for SHA-256 7caccdb1abf6f333…

MALICIOUS

PDF

73.6 KB Created: 2021-04-08 19:03:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: b6b009e5b0e48873d866897ad64c8271 SHA-1: 2ddb6ffacd7ea3c29bcac79a2242e1bdf1c143a0 SHA-256: 7caccdb1abf6f333408040e48ecb201fd79bd7323dd3ead1de645ffd4928c769
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous links, many pointing to disposable hosting domains, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly indicate a phishing or malware distribution attempt.

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://seumenha.ru/strik?utm_term=dutch+oven+cooking+for+two PDF link annotation
    • http://nat-yoga.space/bejovomiduxekekeyqw.pdfIn PDF document text
    • http://bonboxstudio.com/electrician_apprentice_practice_test_freeecfkn.pdfIn PDF document text
    • https://negipefit.weebly.com/uploads/1/3/6/0/136054485/vasowox.pdfIn PDF document text
    • https://witowufagefalob.weebly.com/uploads/1/3/0/7/130738848/tadokusojidijikutu.pdfIn PDF document text
    • http://vukuradi.mygamesonline.org/21318126607.pdfIn PDF document text
    • https://sevipopiwipuf.weebly.com/uploads/1/3/5/3/135302768/kavibozibiv.pdfIn PDF document text
    • http://getbuiss.online/jemojijukabelusufefaxifujxl659.pdfIn PDF document text
    • http://giwosesupalu.medianewsonline.com/design_patterns_explained_github.pdfIn PDF document text
    • https://silajawa.weebly.com/uploads/1/3/4/3/134339193/rutijulawuz.pdfIn PDF document text
    • https://voperupazekeko.weebly.com/uploads/1/3/4/5/134505312/jatutatut.pdfIn PDF document text
    • http://vvd.bar/dictionary_fullnnewy.pdfIn PDF document text
    • http://cancandance.org/encounters_and_foundations_to_1800i6ce0.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/bajapovogam/que_es_una_fotografia_digital.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/100c1e2f-f700-429d-a642-6dadc8172f9d/cs_lewis_quotes_mere_christianity.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/01ae746c-7f2e-406a-a02b-c674051111d3/data_structures_using_c_tutorialspoint.pdfIn PDF document text
    • https://s3.amazonaws.com/varoximu/cholesterol_and_steroid_metabolism.pdfIn PDF document text
    • https://s3.amazonaws.com/wolawatin/lang_leav_lullabies_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3ec39481-d9a4-42bb-aac9-74451184f9f8/descargar_firmware_para_router_d_link_dir_615_m2.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2efc199f-c85e-4a88-9788-a370b657a830/bumodinexigawitib.pdfIn PDF document text
    • https://s3.amazonaws.com/jajoxulabojaso/soil_mechanics_and_foundation_engineering_by_sk_garg_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_off0000e587.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE587 4940 bytes
SHA-256: 9f141ad60c1ac4519fb18a8a1450de3a771f65be3edb0a39317875c648e18e59
font_01_sfnt_off0000f675.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF675 10352 bytes
SHA-256: 9f40c0b5377c3fab14090f7da6f805223b2bb458494e69db379fa54632122d3f

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