Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b09de84ab5b935c…

MALICIOUS

PDF

78.5 KB Created: 2021-03-09 12:17:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 0688ae00783b4aaddd869d02200586b5 SHA-1: 494c177a9fbf537b87d2af5cfda71713e6d726b8 SHA-256: 1b09de84ab5b935c92be04909899d9a812a20c8a5a20deff4f5e141f7826faf0
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable domains and Weebly/S123-hosted PDFs, indicating a link farm or SEO spam operation. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://nipisod.ru/award?keyword=zelda+ocarina+of+time+3ds+guide+pdf PDF link annotation
    • http://zoneeuro.pro/sutorofibalupp8a1.pdfIn PDF document text
    • https://batigagonu.weebly.com/uploads/1/3/4/7/134774980/2694867.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365576/normal_6007d4445943d.pdfIn PDF document text
    • http://zuvels.xyz/71457432387akwcd.pdfIn PDF document text
    • http://megahit.space/online_registration_form_of_uosdlv5i.pdfIn PDF document text
    • https://lotojenamiz.weebly.com/uploads/1/3/1/3/131381761/bufuzonaxewidulirad.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404124/normal_5fe92c0cb514b.pdfIn PDF document text
    • http://fruitnaturs.space/cambridge_igcse_ict_second_edition_free_downloadw74x2.pdfIn PDF document text
    • https://bemagage.weebly.com/uploads/1/3/4/5/134525224/d7dcbd37d943.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467003/normal_6032c63c18e74.pdfIn PDF document text
    • https://sakojokotinij.weebly.com/uploads/1/3/1/3/131379540/tudejawedavovof_kujodu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485826/normal_5ffec2ca1cc16.pdfIn PDF document text
    • http://kvrovk.xyz/dragon_age_awakening_gift_guidexj8hs.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473651/normal_600a9de03c725.pdfIn PDF document text
    • https://zuvimetuna.weebly.com/uploads/1/3/5/3/135304981/1978530.pdfIn PDF document text
    • https://sejevijuwev.weebly.com/uploads/1/3/2/7/132712154/nivimebiludat.pdfIn PDF document text
    • https://gupoxebexu.weebly.com/uploads/1/3/4/3/134337811/4f6771d9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416331/normal_5fca45de952e0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420020/normal_603f11649d642.pdfIn PDF document text
    • https://virutabadipepuv.weebly.com/uploads/1/3/1/3/131398083/fuwifetopezosutifita.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://6e37e838-c278-4d46-baa9-25b8497af200.filesusr.com/ugd/fbcb80_bd065c98d42a477eb92e10d99f992967.pdf?index=trueIn PDF document text
    • https://cb2d4818-2134-4ea5-ae57-1bc45cfc4292.filesusr.com/ugd/7e787c_b7cec1b604794b10a1d67070c5e2ec9e.pdf?index=trueIn PDF document text
    • https://b54663a3-ff9d-4122-b75c-69b71428c9b0.filesusr.com/ugd/cfa91a_0fbb8a273dca4276ae04fdd71689a2cd.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e78f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE78F 5480 bytes
SHA-256: bda9726270076ca543fc8caeaf77e39b75e58d3f24511bd89b62dcbf5e146c4d
font_01_sfnt_off0000fa18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA18 10544 bytes
SHA-256: 0fff2fe8b5d845b4c10f20eaeae2f5770765719cea3c458862ff6eb94686207e
font_02_sfnt_off00011df1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DF1 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230