Malicious PDF — malware analysis report

Static analysis result for SHA-256 126b8d9e1b55354c…

MALICIOUS

PDF

74.5 KB Created: 2021-03-17 17:15:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 030016338e742eb53cae7472203ec47d SHA-1: 92f5a4e1c8c1e40d4a6d86e04cd93c8c2f295229 SHA-256: 126b8d9e1b55354ca5dbc9febd0c97b8bf0aec8f7328134ab606ed964bdc8f56
186 Risk Score

Malware Insights

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

The PDF document contains numerous external links, many pointing to disposable domains, suggesting a link farm or SEO manipulation tactic. ClamAV and ML classifiers identified the file as malicious, specifically a phishing trojan. While no scripts were directly extracted, the PDF structure and external link farm behavior are indicative of malicious intent, likely to redirect users to phishing sites or host malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://druttle.ru/wix?keyword=hp2311x+check+video+cable PDF link annotation
    • https://cdn.sqhk.co/dutararopat/fWynjem/case_study_sample_format_for_students.pdfIn PDF document text
    • https://cdn.sqhk.co/rujoremebi/gfigjgc/finalebepevuxa.pdfIn PDF document text
    • http://subuxiwubemew.getenjoyment.net/keurig_model_k10_instructions.pdfIn PDF document text
    • https://cdn.sqhk.co/lokijuzim/gDmMicX/56535229374.pdfIn PDF document text
    • https://cdn.sqhk.co/numiwuzuwix/ggHaf7X/46356998843.pdfIn PDF document text
    • http://socialwave.me/oster_digital_air_fryer_oven_reviewfxb2z.pdfIn PDF document text
    • http://lozhobelir.space/conclusion_for_lit_reviewybzaf.pdfIn PDF document text
    • https://cdn.sqhk.co/wofosavafiju/hln5TjN/mofeduwegiwarek.pdfIn PDF document text
    • https://cdn.sqhk.co/kebabefepu/bicAnif/pabedezumug.pdfIn PDF document text
    • http://fosonelotila.medianewsonline.com/best_love_quotes_for_her.pdfIn PDF document text
    • https://cdn.sqhk.co/mibemofega/fTggyFC/98438799782.pdfIn PDF document text
    • https://cdn.sqhk.co/vuxesojogugu/dnLhbvy/tangle_master_3d_level_38.pdfIn PDF document text
    • http://covid-19online.site/546564370141xt1l.pdfIn PDF document text
    • http://atlas-copco.su/discovering_computers_shelly_cashmanbvh6u.pdfIn PDF document text
    • http://pasadurasasagi.medianewsonline.com/interview_questions_on_java_for_freshers.pdfIn PDF document text
    • http://reliables.ru/32645548423914w0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://4d3f6715-1114-433d-a4b7-45a5e22e3858.filesusr.com/ugd/ce86b4_d1db2b30984e418392d295f8b8a0331a.pdf?index=trueIn PDF document text
    • https://6d5fec37-5936-4ae8-8938-03a86e982f09.filesusr.com/ugd/d4da64_7f44581087704a90a4f94bfec1f38f55.pdf?index=trueIn PDF document text
    • http://bagugexasorip.myartsonline.com/harry_potter_and_the_half-blood_prince_2009_trailer.pdfIn PDF document text
    • http://lupixopuvir.onlinewebshop.net/imax_b6ac_dual_power_manual_en_espaol.pdfIn PDF document text
    • https://17673d3b-e5d0-4e0e-8211-f079fadf35f5.filesusr.com/ugd/13ae68_0f7fb7c972f040f0930a92dae15541c0.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_off0000e37a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE37A 5528 bytes
SHA-256: 73995b5392d3f4d7c107243c9536ca1b483ca61359f159a384110c7043cc7e74
font_01_sfnt_off0000f64d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF64D 11464 bytes
SHA-256: e5f6534fde7584da1cfa859e7ce01a080251232822107e8643a37fae90c62081

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