Malicious PDF — malware analysis report

Static analysis result for SHA-256 40a8894e745377ba…

MALICIOUS

PDF

72.2 KB Created: 2021-02-24 10:04:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 370e828aaae0d98460b50b1388dca005 SHA-1: d23bd6ef82f0ad1492ce40c1138bb31fe5ee6c71 SHA-256: 40a8894e745377ba1d40c93f712ff2b358c5ca406ccc5eac3966fa8adcd4663f
244 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of embedded URLs, suggesting it functions as a link farm designed to redirect users to potentially harmful sites. The presence of a malicious redirector link further supports this assessment.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/strik?utm_term=medical+school+personal+statement+examples+uk In PDF document text
    • https://static.s123-cdn-static.com/uploads/4491670/normal_6008950070505.pdfIn PDF document text
    • https://fojowixejomad.weebly.com/uploads/1/3/2/6/132681658/6689776.pdfIn PDF document text
    • http://stassikorskyi.com/dewalt_cordless_drill_charger_instructionsx0id1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470408/normal_5fca9c03cfe2f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4503524/normal_6022674b2787b.pdfIn PDF document text
    • https://faneboluti.weebly.com/uploads/1/3/4/4/134464249/e2cedbb84617f8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382621/normal_5fe62307a7848.pdfIn PDF document text
    • https://fofomobagukewe.weebly.com/uploads/1/3/4/3/134352826/lakenemidapiwom.pdfIn PDF document text
    • https://fobepuwup.weebly.com/uploads/1/3/1/0/131070598/kajepebadez_xowajut_zupovotibudinej.pdfIn PDF document text
    • https://cdn.sqhk.co/giripiponi/2jcicgj/63665431501.pdfIn PDF document text
    • http://blue-tick-central.com/catalogo_mary_kay_septiembre_2020_mexicoo440r.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413703/normal_6033452766b8d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417662/normal_600cece9d98b8.pdfIn PDF document text
    • https://cdn.sqhk.co/sirejeforox/gdevCid/sudoku_247_hard.pdfIn PDF document text
    • https://kerumeso.weebly.com/uploads/1/3/4/6/134641164/8734446.pdfIn PDF document text
    • https://bedaruwi.weebly.com/uploads/1/3/5/3/135326402/933329.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
    • 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_off0000d091.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD091 5332 bytes
SHA-256: 265d9e0f9fae74386252f5fe634334951915153b4e180520d8a504588b47a7f9
font_01_sfnt_off0000e280.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE280 10372 bytes
SHA-256: 30c8b91b74bfe29e4976aeb0e7ec5d8ae5cef33dc5285658ce778acb227e6246
font_02_sfnt_off000105d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105D2 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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