Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2ee43ccb5c724e1…

MALICIOUS

PDF

93.4 KB Created: 2021-05-23 17:55:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: a09b599f6c8cc8aae4b8b135e9913b2b SHA-1: 8192fd73410aacc8a447cce6f44e7c7be554e07d SHA-256: a2ee43ccb5c724e17b306812f6583f1bb515ed3db9dbef0171b3e0495e108594
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 0.9996

Heuristics 6

  • 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 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://jacksth.ru/strik?utm_term=pokemon+shiny+gold+x+guide PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4376380/normal_5fd61b202cd42.pdfIn PDF document text
    • https://wufaxewixebel.weebly.com/uploads/1/3/5/3/135302410/bimodoferoxiwug.pdfIn PDF document text
    • https://burogoga.weebly.com/uploads/1/3/2/7/132740280/birotut.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423714/normal_605aa47ee34dd.pdfIn PDF document text
    • https://xirofepomare.weebly.com/uploads/1/3/0/8/130814083/1ef7c350975.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484639/normal_6035949ba3503.pdfIn PDF document text
    • https://kesobimagebow.weebly.com/uploads/1/3/5/9/135978915/1732304.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412174/normal_6059600973780.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393345/normal_5fe1408aee219.pdfIn PDF document text
    • https://guxozagubixox.weebly.com/uploads/1/3/1/4/131437827/85a020953dc77a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387061/normal_6008f7fc8d1c0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483624/normal_60558b22eaee5.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/66a366e6-f165-47ac-aaee-3da41fc56686/descargar_juegos_para_xbox_360_iso_mega.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b1e092c3-161f-4f25-8814-ac7937ade631/philips_gogear_not_charging.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/26c40d85-5741-4940-8ea2-2fd7144bebae/how_to_get_credits_sims_3_university.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e905e39c-ae1d-4519-8516-805979e611ee/zupifomexo.pdfIn PDF document text
    • https://s3.amazonaws.com/bitajemisajoz/1289954906.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/137a233f-de17-4f4e-8a10-f79e0b00dac6/how_to_pause_a_planet_fitness_membership.pdfIn PDF document text
    • https://s3.amazonaws.com/jifesu/covid_19_safety_plan_ontario.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/31c9330d-4ac3-4b7d-9709-fcda0bc99966/need_for_speed_most_wanted_2005_download_apkpure.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/19b85e3a-6453-4d49-8d7e-5875f4372250/49844520493.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/23befc97-fd62-43f0-82c0-63ee0e72e9f6/how_to_use_webcam_on_samsung_smart_tv.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_off00012d7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D7C 5168 bytes
SHA-256: 0c71e48b6bae3707166c6de9af6365727b1533977fabb9789a3f330d31d366a9
font_01_sfnt_off00013f03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F03 12728 bytes
SHA-256: d8f43a8a7c3b49aa1212e94a3b5ea38e807d30932cb043cabbc3143d20108339