Malicious PDF — malware analysis report

Static analysis result for SHA-256 4de84d123d1b5bf3…

MALICIOUS

PDF

82.4 KB Created: 2021-06-14 19:47:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: a751035ed5968fb4941347604df15d85 SHA-1: 2a947927da57fc5cd2b7e6d7917c577f9a2721f9 SHA-256: 4de84d123d1b5bf3195cb63c8b146e91ad6f0418969b28cbd34c54e21c66ce3c
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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://inwebjor.ru/pbw?utm_term=attack+on+titan+manga+free+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4493198/normal_600fdf3f31227.pdfIn PDF document text
    • https://basitonivi.weebly.com/uploads/1/3/4/5/134584834/lazajidurujeki.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476272/normal_600e713c90e22.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483075/normal_6050c97a13fbb.pdfIn PDF document text
    • https://bisubobotikimix.weebly.com/uploads/1/3/1/4/131438323/tovelezabiz-jevumevariv-vibituvitir-nobarevinixifit.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401691/normal_5fe9cda828685.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447464/normal_6022d9d18d9c5.pdfIn PDF document text
    • https://gozobamo.weebly.com/uploads/1/3/4/7/134714837/fogalof_feloj_fidam.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368746/normal_5fc826665b2b6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490918/normal_601149c0df108.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500674/normal_603711c903c61.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4465390/normal_60b59327288ed.pdfIn PDF document text
    • https://nozirurabi.weebly.com/uploads/1/3/0/7/130738896/nefelegakitid_mezumusafu_ropas_mofoke.pdfIn PDF document text
    • https://fewanisip.weebly.com/uploads/1/3/2/7/132712603/zofata_gisomofumosevi_pizunotijezorak.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/60af4103-235e-4666-bf80-7b5b8957b873/best_robot_vacuum_and_mop_combo_2020_uk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0b564090-bb17-42b5-91d8-af003ee61ce6/what_does_a_tantric_practitioner_do.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/97611916-a116-466c-baa2-a97efa861642/fulubujom.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4b380970-ee13-4c60-9348-0ff90aeaf06e/cloud_9_smoke_shop_kennesaw_ga.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4d97ec85-4598-4891-af23-608dcc327f0b/56503297814.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d6f00244-b1f4-417d-8349-85e7067dbfbf/male_height_and_weight_chart_by_age.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/92d74a64-1c4e-41bb-9c9f-b456a2fb59e8/88742948355.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3f46a6bb-2d0a-4257-a036-52c2c43906f5/rosos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/49b60b33-3852-4c9b-af4f-2fecf164a0af/logitech_wireless_keyboard_k360_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/07591ef8-d307-4b29-a6d6-c6d436b4dff2/inteligencias_multiples_concepto_segun_autores.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/894e39ee-f381-4b20-b6e3-792eb0789a54/mosefer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/90481071-4f1b-444f-b9a8-a6d1e6a3baa5/78963077706.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f1e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1E3 5316 bytes
SHA-256: 0ee382825fe39061bfffebc96d236b1c1b9156142fda8d54d731e628534b6119
font_01_sfnt_off000103e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103E7 10096 bytes
SHA-256: 6285c75875adb7d6f14ec6c2affccb89623920738283c08324eb0b2ee8a357a3
font_02_sfnt_off0001269f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1269F 16172 bytes
SHA-256: dc81cd4a696a878a4fbbde3493283acaa0ebb1b6d8b911827813da393fc73cd0