Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb2d78a599cd27e4…

MALICIOUS

PDF

73.1 KB Created: 2021-03-18 03:46:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 6525c7d098a2f5637cc021265ed901ca SHA-1: 260d46a57f6d79c8563caaf5b1a8f9395c2286e1 SHA-256: fb2d78a599cd27e4e4dd13b53a1e9e7a78cbc8d6ec97d3f48f386cc40fa8d17d
186 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, suggesting it functions as a link farm or phishing lure. While no scripts were explicitly extracted, the presence of numerous URLs, including suspicious ones like 'xajibur.ru', points towards an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://xajibur.ru/123?utm_term=af+full+service+dress+uniform PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4412778/normal_60121c37746c4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465269/normal_60510d5d906a9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408321/normal_602e366be7a7c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459914/normal_60501027cd206.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371783/normal_6051f19404718.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448547/normal_6045f27809458.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465398/normal_603813bc9f0e7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465269/normal_5fee2691a4947.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dusiwesidixe.epizy.com/hotmail_activesync_settings_android.pdfIn PDF document text
    • https://4adff18d-dc39-4349-be2c-eeb12737f1cb.filesusr.com/ugd/9117e0_b51090c92f8a40aaaf2b272b9ecf4018.pdf?index=trueIn PDF document text
    • http://sabinozugi.epizy.com/80558328683.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e6134dd6-cd01-423e-a1bf-fbdc9e6a572c/mini_smart_socket_stopped_working.pdfIn PDF document text
    • https://755d026c-fd58-4633-9ca9-8af24261f473.filesusr.com/ugd/4622eb_ea651077adfc45e7b59d91d91f8941ca.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c6c18da1-def1-4247-b994-b4b9a86cc37f/grohe_minta_kitchen_tap_installation.pdfIn PDF document text
    • https://8d90b851-447f-4cfc-ac95-1e867b71b983.filesusr.com/ugd/b371d9_e80639d8028e45e8831e5306d2c9be65.pdf?index=trueIn PDF document text
    • https://ce3a146a-d504-4efb-981c-4593fb85d965.filesusr.com/ugd/5b5da7_67d58913668b48699d398fa0f693da89.pdf?index=trueIn PDF document text
    • https://5e6d3f51-9b35-4a29-baf4-1f036254a461.filesusr.com/ugd/99a8f2_d21828840b734eee88ce41f613913220.pdf?index=trueIn PDF document text
    • http://gevewodex.epizy.com/the_door_in_the_wall_plot_summary.pdfIn PDF document text
    • https://11627308-8c8f-4f08-99ed-0ad85160907d.filesusr.com/ugd/682d1c_42d0e3ae950941e8be1c2f095e4392d9.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ebb592c2-7431-48f2-b6fa-5f6cf1d2b025/ssr_125_race_cam.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_off0000e255.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE255 5008 bytes
SHA-256: 58b8f8edb5dd83ecb6ad4b351849f5a59b80194e1673ed7bd873e37acd248f04
font_01_sfnt_off0000f353.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF353 10400 bytes
SHA-256: bb3112391794fda18c58c719ee1eecf0f1064a808f0643cc47f3ad375b3de40b