Malicious PDF — malware analysis report

Static analysis result for SHA-256 1faaadd54c9c80f9…

MALICIOUS

PDF

75.2 KB Created: 2021-03-16 01:17:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: c83af8ac24ef0e9f8853b4f6913b0b65 SHA-1: 57a9d7d0987fd7046149776af99d90fa53784064 SHA-256: 1faaadd54c9c80f92ccfbd0b9fafe1a124d657e9481caa6f4554bea8a5c4a1ed
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 0.9998

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://mezovuduw.ru/wix?keyword=a+man+for+all+seasons+pdf+online PDF link annotation
    • https://farenutatovepo.weebly.com/uploads/1/3/4/5/134502273/6cca091.pdfIn PDF document text
    • http://taribada.22web.org/mipojinunufibelizuv.pdfIn PDF document text
    • http://de-bewertung-889562.icu/model_cerere_concediu_odihna_20175s0np.pdfIn PDF document text
    • http://lovelyhouse.online/76416864652d41v.pdfIn PDF document text
    • https://sebikiwar.weebly.com/uploads/1/3/5/9/135962157/b10dafa2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://0502d5d0-a0f5-47b8-bc1c-644c46e4e431.filesusr.com/ugd/6cabbb_52bb9b20c569429c8209d257bc861413.pdf?index=trueIn PDF document text
    • https://a6132035-7465-4fe4-be4e-2faa96c22dab.filesusr.com/ugd/cf950b_413f6c3004074697b8e05047d71310bf.pdf?index=trueIn PDF document text
    • https://50aad03f-9d2a-47e6-be13-abd12f321b17.filesusr.com/ugd/3fd638_c35056f342ae46069672a40f6b85565d.pdf?index=trueIn PDF document text
    • http://gadiwovujema.epizy.com/wipumasi.pdfIn PDF document text
    • https://b67fa923-03b4-4d21-b555-95ff628d7525.filesusr.com/ugd/1d4b90_e9311e46945f453fa1f0aa7f300d53a5.pdf?index=trueIn PDF document text
    • https://6376acfe-5884-4251-b3d5-19a03c044549.filesusr.com/ugd/de3d83_e1afbbf8919d4d9b8eef28a19c8e8165.pdf?index=trueIn PDF document text
    • http://vezapuro.rf.gd/47006433451.pdfIn PDF document text
    • https://6998e30b-c911-4113-ab34-4c15204891c7.filesusr.com/ugd/429b25_7ce31c364824410695110ea3297adade.pdf?index=trueIn PDF document text
    • https://168d2a81-f750-40c6-a653-3787650f980d.filesusr.com/ugd/3bcfef_449cae1e1a254383a93b9a6281ae6f7e.pdf?index=trueIn PDF document text
    • https://f62823ea-e863-4eb7-bd7c-e3bac0139ff1.filesusr.com/ugd/8c639a_95c3302d24d34a3bb1975b755b79740a.pdf?index=trueIn PDF document text
    • https://973697ad-ffa4-4f9d-85cd-0c9d1ea039ee.filesusr.com/ugd/5f5755_ccea59ed0d474ec0acace88e7e0622ab.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e5bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5BD 5176 bytes
SHA-256: 5bb06dc1077faf207efb84504045cfab05191f57c24637becdda41eabff4ba3a
font_01_sfnt_off0000f742.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF742 11760 bytes
SHA-256: d954b10aaa1b902728cf18f26c734bd4e3c0d7f5608076bafa3bdd7e6010b8bd

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