Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc85cef64a161720…

MALICIOUS

PDF

80.2 KB Created: 2021-03-14 11:31:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 9199c76755f307f0005c1a283275538e SHA-1: 21bd59cb8de3dcba39ae75f422eec3e74d9c100a SHA-256: bc85cef64a1617209271df406da837123186623eadd06e7d509321f9983ab167
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one heuristic specifically identifying it as a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. ClamAV detection and ML classification strongly indicate malicious intent. Although no scripts were extracted, the extensive use of external links points to an attack pattern focused on redirecting users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

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://seumenha.ru/strik?utm_term=maiden+voyage+herbie+hancock+form PDF link annotation
    • http://help-service-support.com/jolerevojegofigei37.pdfIn PDF document text
    • http://ita-bio.fun/hp_laserjet_pro_400_toner_price_in_pakistan22vbp.pdfIn PDF document text
    • http://weboxima.22web.org/food_chain_worksheet_grade_3.pdfIn PDF document text
    • http://dabobez.22web.org/zumixazujixu.pdfIn PDF document text
    • http://chambre.xyz/does_dominos_have_vegetarian_pizzaq86kd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412391/normal_60017189f2cd6.pdfIn PDF document text
    • http://nisefobodidave.22web.org/forcepoint_ngfw_datasheet.pdfIn PDF document text
    • http://interior.estate/breitling_aerospace_evo_specsx9nd0.pdfIn PDF document text
    • http://wotodusasesode.iblogger.org/99155729718.pdfIn PDF document text
    • http://info-pages.ru/senior_data_analyst_skill_setj6kjq.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493227/normal_603f1e656b058.pdfIn PDF document text
    • http://fadaduvafobetup.iblogger.org/71279134494.pdfIn PDF document text
    • http://milafikolume.iblogger.org/tom_clancys_rainbow_six_siege_gold_edition_vs_normal.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489251/normal_603eb42517402.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xelidamos.epizy.com/eve_starter_guide_2019.pdfIn PDF document text
    • http://bimuzazun.epizy.com/juletexovotodoxeto.pdfIn PDF document text
    • https://9d76d0c6-5807-43ac-a2ba-7b4112d1a20a.filesusr.com/ugd/5cd33b_e740634caa224646a54363542a84c1e6.pdf?index=trueIn PDF document text
    • https://9f9bd9fa-00fe-4673-b34e-9a629881f524.filesusr.com/ugd/09273f_b34e3fb96b354bb690639bdaf2ca661a.pdf?index=trueIn PDF document text
    • https://f039f7e9-c7fa-441d-bf3d-2f0e35d6be10.filesusr.com/ugd/80685d_61cf2d82c21e498bbddf7a17f27043ed.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/pevarijidasalop/escape_room_level_225_answer.pdfIn PDF document text
    • https://s3.amazonaws.com/bugutaj/netgear_fs108_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/jotogorurekuro/biology_book_form_3.pdfIn PDF document text
    • http://luselobek.epizy.com/82231019543.pdfIn PDF document text
    • http://vanuxulo.rf.gd/catalina_rivas_books.pdfIn PDF document text
    • https://bd7a0a6f-bbfd-49cc-ba41-c3f2778102d9.filesusr.com/ugd/9ea91e_88b03056001b4d5f81ca43dfc1342b5f.pdf?index=trueIn PDF document text
    • https://2ea9429b-0332-4ee6-bb75-ab9535b56c99.filesusr.com/ugd/e2f7e1_26fe2a829a69443fa93b68d651384cc7.pdf?index=trueIn 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_off0000faa7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAA7 5596 bytes
SHA-256: 9f9f17d963dfee36b3904dc62b18a4d06c597db70757761ffa0d6dbec0ef93ec
font_01_sfnt_off00010db5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DB5 11392 bytes
SHA-256: fd1459d2f2a4b84fd3c5ad00fc90d933ea0507cdc7676d4a951ef5a7a256f08c

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