Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9450cc9414a5a1e…

MALICIOUS

PDF

89.0 KB Created: 2021-06-09 00:10:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 7de1cacb2dbe193bb431436a55bef53a SHA-1: 3b8d13470a5bbd75c07accb3388f6f4425ef569b SHA-256: e9450cc9414a5a1eb5ceb914925cf1a5d8b8c3bd7aa8a4efb007803bb49b5afd
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The presence of embedded URLs, particularly 'https://crewmak.ru/pbw?utm_term=i+just+wanna+rolex', suggests an attempt to redirect users to a potentially harmful site. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports the idea of a link-based attack, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://crewmak.ru/pbw?utm_term=i+just+wanna+rolex PDF link annotation
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • http://sozevupegufi.pbworks.com/f/tezegal.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/18259be2-d856-4e17-b631-aa1c6b8f3280/2225213077.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f2269bcd-fadb-458c-be26-316964c014b2/how_do_you_pair_a_logitech_wireless_keyboard.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f7bbdb49-78dc-45a0-90cd-8f68f2f6bab6/62913090128.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/748c77ab-2498-4fcc-bdc4-4b8e8006efdb/pafuxunizo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c083799f-6021-4fff-b166-bf429af8e65b/50161013776.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3004a9bb-9582-44ab-a7a2-36498131bf77/memory_trace_definition_psychology.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6341e7ea-f9bb-4a28-b5bb-a105d50e710d/tetepiragudus.pdfIn PDF document text
    • http://bilabegape.pbworks.com/f/how_to_prepare_for_fasting_blood_test.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7cb2c60f-ed0f-4cf8-8983-cca0758deee2/why_inorganic_chemistry_is_important.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0a9bcf59-898c-4bf0-aa81-6b79c4665d1b/77520760523.pdfIn PDF document text
    • http://wiliser.pbworks.com/f/how_to_calculate_simple_interest_and_maturity_value.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d36d01f5-8743-46ec-a71c-b383a3e8ee51/16669807654.pdfIn PDF document text
    • http://morabef.pbworks.com/f/how_to_get_a_free_membership_on_prodigy_without_paying_2021.pdfIn PDF document text
    • http://daladefadus.pbworks.com/f/98_mustang_auto_to_manual_swap.pdfIn PDF document text
    • http://silasofinat.pbworks.com/f/distribuio_de_frequencia_exercicios_resolvidos_passo_a_passo.pdfIn PDF document text
    • http://kobowal.pbworks.com/f/pifukovodiwasan.pdfIn PDF document text
    • http://xotokuwawa.pbworks.com/w/file/fetch/144775365/46877716282.pdfIn PDF document text
    • http://fibonilavi.pbworks.com/f/mi_maestra_es_un_monstruo_libro_completo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ab4d18cb-10a8-4377-9aba-99f14e362a05/how_long_does_it_take_to_regulate_a_diabetic_cat.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2266d523-a6c4-448b-bcc8-c0c283738895/guvowodaduliveriz.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f43a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF43A 4852 bytes
SHA-256: 8ad3f016ddbf5373bdd9e254f5bc4006833429e3dbd41a00b6af62f3c02f40eb
font_01_sfnt_off000104da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104DA 12824 bytes
SHA-256: 85cabd82a1e9f4c435333ec4760f7a957e7780b5f2c58fb2206be8e529e89e94
font_02_sfnt_off00012f73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F73 18132 bytes
SHA-256: 4a82a3208793ed66c7ad2618ae6b04e35cf9a04a25600665c0315d679802973e
font_03_sfnt_off00014b8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B8B 2996 bytes
SHA-256: d5340a0826b1676b002c5df5d2b48fac83e5b47283b47a8ae9a8afd17b5e3da0

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